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VSTO Development - Key Improvements In VS2010 / .NET 4.0?

- by dferraro

Hi all, I am trying to make a case to my bosses on why we should use VS2010 for an upcoming Excel Workbook VSTO application. I haven't used VSTO before but have used VBA. With 2010 just around the corner, I wanted to read about the improvements made to see if it was worth using 2010 to develop this application. So far I have read 2 major improvements are ease of deployments and also debugging / com interop improvements ... I was just wondering if there was anything else I wasn't aware of, or if anyone here is actually developing in VSTO and has used 2010 and both 2008 and could help make a case / arm me with information. The main concern of my bosses is deploying .NET 4.0 runtime on the Citrix servers here... however it seems that with 3.5, we would have to deploy the VSTO runtime and PIA's, etc... So really wouldn't deployments be easier with 2010 because installing just the 4.0 runtime is better than having to install the 'VSTO Runtime' as well as PIA's, etc? Or is there something I'm missing here? Anyone here deploy VSTO app in an enterprise and can speak to this? Also - I'm trying to also fight to use C# over VB.NET for this app. Does anyone know any key reasons why (except for my bias on preference of syntax) it would be better to use C# over VB for this? Any key features lacking in VB VSTO development? I've read about the VSTO Power Tools, and one of them describes LINQ enalbment of the Excel Object Model classes - however it says 'a set of C# classes'... Does anyone know if they literally mean C# - so this would not work with VB.NET, or do they just mean the code is written in C#? Anyone ever used these power tools with VB? I am going to download & play with it now, but any help again is greatly appreciated Thanks very much for any information.

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"Could not load file or assembly 'System.Web.Mvc, ...

- by Zack Peterson

My new ASP.NET MVC Web Application works on my development workstation, but does not run on my web server... Server Error in '/' Application. Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: Could not load file or assembly 'System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. Source Error: Line 44: <add assembly="System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> Line 45: <add assembly="System.Web.Routing, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> Line 46: <add assembly="System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> Line 47: <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> Line 48: <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> Source File: C:\inetpub\www.example.org\web.config Line: 46 Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded. WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053 Do I need to install the AspNetMVCBeta-setup.msi on the server? Or is there a different installer for servers?

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Dynamically specify and change a Silverlight DataGrid's columns during runtime (MVVM)

- by Biggert

What's the best method of dynamically specifying DataGrid columns in the Silverlight DataGrid control at runtime following the MVVM pattern? What I'd like to do would be bind the "DataGrid.Columns" property to a property in my ViewModel so that, if the user adds/removes columns, I simply update the ViewModel property and the DataGrid would change. Problem is, the "DataGrid.Columns" property can't be bound to (I don't think). Because this property isn't available nor is the DataGrid control itself available at the ViewModel level, my current approach is to step outside of the MVVM pattern for this particular implementation and capture certain events in View's code-behind using MVVM Light's Messenger class and then talk directly with the DataGrid control to achieve this capability. I know this is a general statement to this approach without details but is there an easier way... or maybe not so much easier, but a better way that adheres to the MVVM pattern a little better? It's driving me crazy that the DataGrid control's Columns property can't be bound... seems like such a simple thing. FYI - Before it's suggested to use AutoGenerateColumns = True, the class being bound for each item in the collection that's bound to DataGrid.ItemsSource does not have individual properties to identify what is bound to the columns... it's a collection property that contains the columns in order to keep them completely dynamic so that particular path is out. Also, handling the AutoGeneratingColumns and using e.Cancel to show/hide columns is also iffy for this same reason (I think).

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Delegate.CreateDelegate() and generics: Error binding to target method

- by SDReyes

I'm having problems creating a collection of delegate using reflection and generics. I'm trying to create a delegate collection from Ally methods, whose share a common method signature. public class Classy { public string FirstMethod<out T1, in T2>( string id, Func<T1, int, IEnumerable<T2>> del ); public string SecondMethod<out T1, in T2>( string id, Func<T1, int, IEnumerable<T2>> del ); public string ThirdMethod<out T1, in T2>( string id, Func<T1, int, IEnumerable<T2>> del ); // And so on... } And the generics cooking: // This is the Classy's shared method signature public delegate string classyDelegate<out T1, in T2>( string id, Func<T1, int, IEnumerable<T2>> filter ); // And the linq-way to get the collection of delegates from Classy ( from method in typeof( Classy ).GetMethods( BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.NonPublic ) let delegateType = typeof( classyDelegate<,> ) select Delegate.CreateDelegate( delegateType, method ) ).ToList( ); But the Delegate.CreateDelegate( delegateType, method ) throws an ArgumentException saying Error binding to target method. : / What am I doing wrong?

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Iframe src set dynamically through JavaScript is being executed twice on Internet Explorer

- by Pierre

Hello Everyone, I am encountering a very annoying problem with IE. Basically I need to set the source of an IFrame using JavaScript, however the source document is being executed twice not once during each call. The simplified HTML code is pasted below (I simplified it so that readers can understand it quickly. The source is being set through JavaScript since it will contain dynamic content): <html> <head> <title>Iframe test</title> </head> <body> <iframe id="testIframe" scrolling="no" frameborder="0" src="" width="800" height="600"></iframe> <script language="JavaScript"> document.getElementById("testIframe").src = "http://localhost/test.php"; </script> </body> </html> In this example, test.php inserts a record inside a local database once called. Whenever the page above is called using IE, two rows are being inserted on most occasions (sometimes only 1 row is inserted but this is not the norm). I tested the same script on Chrome and Opera and it works correctly on them so this must be an IE issue. If is set the src directly inside the iframe tag IE starts behaving correctly, however I need to be able to build the URL using javascript. Has anyone encountered this issue? and does anyone know of a solution/workaround? Thanks and Regards Pierre

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Reading non-standard elements in a SyndicationItem with SyndicationFeed

- by Jared

With .net 3.5, there is a SyndicationFeed that will load in a RSS feed and allow you to run LINQ on it. Here is an example of the RSS that I am loading: <rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/"> <channel> <title>Title of RSS feed</title> <link>http://www.google.com</link> <description>Details about the feed</description> <pubDate>Mon, 24 Nov 08 21:44:21 -0500</pubDate> <language>en</language> <item> <title>Article 1</title> <description><![CDATA[How to use StackOverflow.com]]></description> <link>http://youtube.com/?v=y6_-cLWwEU0</link> <media:player url="http://youtube.com/?v=y6_-cLWwEU0" /> <media:thumbnail url="http://img.youtube.com/vi/y6_-cLWwEU0/default.jpg" width="120" height="90" /> <media:title>Jared on StackOverflow</media:title> <media:category label="Tags">tag1, tag2</media:category> <media:credit>Jared</media:credit> <enclosure url="http://youtube.com/v/y6_-cLWwEU0.swf" length="233" type="application/x-shockwave-flash"/> </item> </channel> When I loop through the items, I can get back the title and the link through the public properties of SyndicationItem. I can't seem to figure out how to get the attributes of the enclosure tag, or the values of the media tags. I tried using SyndicationItem.ElementExtensions.ReadElementExtensions<string>("player", "http://search.yahoo.com/mrss/") Any help with either of these?

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How can I validate the result in an ASP.NET MVC editor template?

- by Morten Christiansen

I have created an editor template for representing selecting from a dynamic dropdown list and it works as it should except for validation, which I have been unable to figure out. If the model has the [Required] attribute set, I want that to invalidate if the default option is selected. The view model object that must be represented as the dropdown list is Selector: public class Selector { public int SelectedId { get; set; } public IEnumerable<Pair<int, string>> Choices { get; private set; } public string DefaultValue { get; set; } public Selector() { //For binding the object on Post } public Selector(IEnumerable<Pair<int, string>> choices, string defaultValue) { DefaultValue = defaultValue; Choices = choices; } } The editor template looks like this: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <select class="template-selector" id="<%= ViewData.ModelMetadata.PropertyName %>.SelectedId" name="<%= ViewData.ModelMetadata.PropertyName %>.SelectedId"> <% var model = ViewData.ModelMetadata.Model as QASW.Web.Mvc.Selector; if (model != null) { %> <option><%= model.DefaultValue %></option><% foreach (var choice in model.Choices) { %> <option value="<%= choice.Value1 %>"><%= choice.Value2 %></option><% } } %> </select> I sort of got it to work by calling it from the view like this (where Category is a Selector): <%= Html.ValidationMessageFor(n => n.Category.SelectedId)%> But it shows the validation error for not supplying a proper number and it does not care if I set the Required attribute.

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Avoid Resource Conflict

- by Yan Cheng CHEOK

I have a MFC exe, trying to dynamic load a MFC dll. // This is code in MFC exe HINSTANCE h = AfxLoadLibrary(_T("DLL.dll")); typedef void(*FUN)(); FUN fun = (FUN)GetProcAddress(h, "loveme"); FreeLibrary(h); Both MFC exe and MFC dll, are having their own resource file. However, I realize that, if MFC exe and MFC dll are having a same resource ID, conflict may occur. // This is code in MFC dll. Both exe and dll, are having resources with // ID 101. CString s; s.LoadString(101); // Resource 101 in exe is being shown :( AfxMessageBox(s); May I know how I can avoid resource ID conflict problem? Can we have two resource in both MFC and DLL, although their ID is different, but they are independent from each other? This means, DLL will only load DLL's resource. EXE will only load EXE's resource.

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how convert DataTable to List<String> in C#

- by Jitendra Jadav

Hello Everyone .. I am using C# Linq now I am converting DataTable to List and I am getting stuck... give me right direction thanks.. private void treeview1_Expanded(object sender, RoutedEventArgs e) { coa = new List<string>(); //coa = (List<string>)Application.Current.Properties["CoAFull"]; HMDAC.Hmclientdb db = new HMDAC.Hmclientdb(HMBL.Helper.GetDBPath()); var data = (from a in db.CoA where a.ParentId == 0 && a.Asset == true select new { a.Asset, a.Category, a.CoAName, a.Hide, a.Recurring, a.TaxApplicable }); DataTable dtTable = new DataTable(); dtTable.Columns.Add("Asset", typeof(bool)); dtTable.Columns.Add("Category", typeof(string)); dtTable.Columns.Add("CoAName", typeof(string)); dtTable.Columns.Add("Hide", typeof(bool)); dtTable.Columns.Add("Recurring", typeof(bool)); dtTable.Columns.Add("TaxApplicable", typeof(bool)); if (data.Count() > 0) { foreach (var item in data) { DataRow dr = dtTable.NewRow(); dr["Asset"] = item.Asset; dr["Category"] = item.Category; dr["CoAName"] = item.CoAName; dr["Hide"] = item.Hide; dr["Recurring"] = item.Recurring; dr["TaxApplicable"] = item.TaxApplicable; dtTable.Rows.Add(dr); } } coa = dtTable; }

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Dynamically create and save image with Django and PIL/Django-Photologue

- by Travis

I want to generate a page of html with dynamic content and then save the result as an image as well as display the page to the user. So, user signs up to attend conference and gives their name and org. That data is combined with html/css elements to show what their id badge for the conference will look like (their name and org on top of our conference logo background) for preview. Upon approval, the page is saved on the server to an image format (PNG, PDF or JPG) to be printed onto a physical badge by an admin later. I am using Django and django-photologue powered by PIL. The view might look like this # app/views.py def badgepreview(request, attendee_id): u = User.objects.get(id=attendee_id) name = u.name org = u.org return render_to_response('app/badgepreview.html', {'name':name,'org':org,}, context_instance = RequestContext(request), ) The template could look like this {# templates/app/badgepreview.html #} {% extends "base.html" %} {% block page_body %} <div style='background:url(/site_media/img/logo_bg.png) no-repeat;'> <h4>{{ name }}</h4> <h4>{{ org }}</h4> </div> {% endblock %} simple, but how do I save the result? Or is there a better way to get this done?

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css - set max-width for select

- by Patrick

I have a form with a drop down list of venues and a submit button. They are supposed to be on the same line, but since the list of venues is dynamic, it could become too long and push the button down. I was thinking of setting a max-width property to the select, but I'm not clear whether this will work in all browsers. Do you have any suggestions on a workaround? form action="http://localhost/ci-llmg/index.php/welcome/searchVenueForm" method="post" class="searchform"><select name="venue"> <option value="0" selected="selected">Select venue...</option> <option value="1">venue 0</option> <option value="2">club 1</option> <option value="3">disco 2</option> <option value="4">future test venue</option> </select> <input type="submit" name="" value="Show venue!" class="submitButton" /> </form> css: .searchform select { max-width: 320px; } .searchform input.submitButton { float: right; }

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"Admin module" taking over [Yii framework]

- by Flavius

Hi I have an "admin" module and I want it to serve "dynamic controllers", i.e. to provide a default behaviour for controllers which don't really exist ("virtual controllers"). I've invented a lightweight messaging mechanism for loose communication between modules. I'd like to use it such that when e.g. ?r=admin/users/index is requested, it will call the "virtual controller" "UserController" of AdminModule, which would, by default, use this messaging mechanism to notify the real module "UsersModule" it can answer to the request. I thought about simulating this behaviour in AdminModule::init(), but at that point I have no way of deciding whether the action can be processed by a real controller or not, or at least I don't know how to do it. This is because of the way Yii works: bottom-up, the controller is the one that renders the view AND the application layout (or the module's, if it exists), for example. I don't think the module even has a word to say about handling a given controller+action or not. To recap, I'm looking for a kind of CWebModule::missingController($controllerId,$actionId), just like CController::missingAction($actionId), or a workaround to simulate that. That would possibly be in CWebModule::init() or somewhere where I can find out whether the controller actually exists, in which case it's his job to handle it the $actionID and $controllerID whether the module $controllerID exists (I didn't type it wrong, in r=admin/users/index, "users" is the actual module, as specified in the application's config).

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Help with stock ticker style scrolling using Core Animation

- by Glen Harding

Hi, I'm looking for some guidance on the best way to implement stock ticker style right-to-left scrolling of CALayers in Core Animation on OSX. I'm pretty new to Cocoa and don't know the best way to implement this. I have a continuous stream of news items and stock details that I turn into CALayers (made up of 1 image and a CATextLayer) and I want to animate the CALayers from right to left of my custom view. The news and stock information is constantly updating so I would like to add 1 item at a time to the view, scroll it right to left until the right-most point of the CALayer is showing, then add another CALayer to the view and start scrolling that as well. I would like to do this dynamic updating instead of taking a big snapshot of all my data, turning it into a big horizontal CALayer and scrolling that. I'm looking for guidance on how to achieve this sort of effect - do I manually animate each new CALayer along a path in the view? Or should I be using CAScrollLayer to achieve this effect? Many thanks Glen.

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How do I use jquery validate remote validation on a field that depends on another field in the form?

- by Kevin J

I have a form in which I am using remote validation to check if an email address already exists in the database. However, the catch is that on this form, the user can select between several different "groups", and each group has its own distinct set of email addresses (thus the same email can exist once in each group). The group selection is a dropdown on the form, and the email address is an input field with remote validation. I have a couple issues. First, I have set up my remote rule like this: remote: { url: 'remote_script.php', data: { group_id: $('select.group_id').val() } } However, this seems to statically set the group_id parameter to whatever the first value in the select is. Meaning, if I change the select, then trigger the remote validation again, the group_id parameter does not change First, how can I make this parameter dynamic, depending on the value of a select in the form? Secondly, how do I manually trigger the remote validation on the email address field? When the group_id select is changed, I want to re-trigger the remote validation on the email address field (without changing the value of the field). I tried using $(selector).validate().element('.email_addr') But this appears to only trigger the standard validation (required, email), and not the remote call.

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C# Design How to Elegantly wrap a DAL class

- by guazz

I have an application which uses MyGeneration's dOODads ORM to generate it's Data Access Layer. dOODad works by generating a persistance class for each table in the database. It works like so: // Load and Save Employees emps = new Employees(); if(emps.LoadByPrimaryKey(42)) { emps.LastName = "Just Got Married"; emps.Save(); } // Add a new record Employees emps = new Employees(); emps.AddNew(); emps.FirstName = "Mr."; emps.LastName = "dOOdad"; emps.Save(); // After save the identity column is already here for me. int i = emps.EmployeeID; // Dynamic Query - All Employees with 'A' in thier last name Employees emps = new Employees(); emps.Where.LastName.Value = "%A%"; emps.Where.LastName.Operator = WhereParameter.Operand.Like; emps.Query.Load(); For the above example(i.e. Employees DAL object) I would like to know what is the best method/technique to abstract some of the implementation details on my classes. I don't believe that an Employee class should have Employees(the DAL) specifics in its methods - or perhaps this is acceptable? Is it possible to implement some form of repository pattern? Bear in mind that this is a high volume, perfomacne critical application. Thanks, j

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Ext3 fs: Block bitmap for group 1 not in group (block 0). is fs dead?

- by ip

Hi, My company has a server with one big partition with Mysql database and php files. Now this partition seems to be corrupted, as reported from kernel messages when I tried to mount it manually: [329862.817837] EXT3-fs error (device loop1): ext3_check_descriptors: Block bitmap for group 1 not in group (block 0)! [329862.817846] EXT3-fs: group descriptors corrupted! I've tried to recovery it running tools from a PLD livecd. These are the tools I have tested: - e2retrieve - testdisk - photorec - dd_rescue/dd_rhelp - ddrescue - fsck.ext2 - e2salvage without any success. dumpe2fs 1.41.3 (12-Oct-2008) Filesystem volume name: /dev/sda3 Last mounted on: <not available> Filesystem UUID: dd51610b-6de0-4392-a6f3-67160dbc0343 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal filetype sparse_super Default mount options: (none) Filesystem state: not clean with errors Errors behavior: Continue Filesystem OS type: Linux Inode count: 9502720 Block count: 18987570 Reserved block count: 949378 Free blocks: 11555345 Free inodes: 11858398 First block: 0 Block size: 4096 Fragment size: 4096 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Last mount time: Wed Mar 24 09:31:03 2010 Last write time: Mon Apr 12 11:46:32 2010 Mount count: 10 Maximum mount count: 30 Last checked: Thu Jan 1 01:00:00 1970 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Journal backup: inode blocks dumpe2fs: A block group is missing an inode table while reading journal inode There's any other tools I have to test before considering these disk definitely unrecoverable? Many thanks, ip

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[C#] Lock a file and avoid readings while it's writing

- by vtortola

Hi, My web application returns a file from the filesystem. These files are dynamic, so I have no way to know the names o how many of them will there be. When this file doesn't exist, the application creates it from the database. I want to avoid that two different threads recreate the same file at the same time, or that a thread try to return the file while other thread is creating it. So I want to lock a file till its recreation is complete, if other thread try to access it ... it will have to wait the file be unlocked. I've been reading about FileStream.Lock, but I have to know the file length and it won't prevent that other thread try to read the file, so it doesn't work for my particular case. I've been reading also about FileAccess.None, but it will throw an exception (which exception type?) if other thread/process try to access the file... so I should develop a "try again while is faulting" ... and I don't like too much that approach, although maybe there is not a better way. How could I archieve this? Kind regards.

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How to break WinDbg in an anonymous method?

- by Richard Berg

Title kinda says it all. The usual SOS command !bpmd doesn't do a lot of good without a name. Some ideas I had: dump every method, then use !bpmd -md when you find the corresponding MethodDesc not practical in real world usage, from what I can tell. Even if I wrote a macro to limit the dump to anonymous types/methods, there's no obvious way to tell them apart. use Reflector to dump the MSIL name doesn't help when dealing with dynamic assemblies and/or Reflection.Emit. Visual Studio's inability to read local vars inside such scenarios is the whole reason I turned to Windbg in the first place... set the breakpoint in VS, wait for it to hit, then change to Windbg using the noninvasive trick attempting to detach from VS causes it to hang (along with the app). I think this is due to the fact that the managed debugger is a "soft" debugger via thread injection instead of a standard "hard" debugger. Or maybe it's just a VS bug specific to Silverlight (would hardly be the first I've encountered). set a breakpoint on some other location known to call into the anonymous method, then single-step your way in my backup plan, though I'd rather not resort to it if this Q&A reveals a better way

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How to Lock a file and avoid readings while it's writing

- by vtortola

My web application returns a file from the filesystem. These files are dynamic, so I have no way to know the names o how many of them will there be. When this file doesn't exist, the application creates it from the database. I want to avoid that two different threads recreate the same file at the same time, or that a thread try to return the file while other thread is creating it. So I want to lock a file till its recreation is complete, if other thread try to access it ... it will have to wait the file be unlocked. I've been reading about FileStream.Lock, but I have to know the file length and it won't prevent that other thread try to read the file, so it doesn't work for my particular case. I've been reading also about FileAccess.None, but it will throw an exception (which exception type?) if other thread/process try to access the file... so I should develop a "try again while is faulting" ... and I don't like too much that approach, although maybe there is not a better way.

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"The name 'WithTable' does not exist in the current context" using Fluent NHibernate

- by Byron Sommardahl

Might be a really easy problem to fix, but it the solution is eluding me! I'm using Fluent NHibernate 1.0 RTM (and using NHibernate bins that ships with it). I'm trying to map my entities and cannot use the WithTable() method. It's not available in Intelligence and VS doesn't suggest any namespaces to reference. Here's my code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using GeoCodeThe.Net.Domain.Entities; using FluentNHibernate.Mapping; namespace GeoCodeThe.Net.Domain.Mappings { class CategoryMap: ClassMap<ICategory> { public CategoryMap() { WithTable("Categories"); // <----- Compile error: The name 'WithTable' does not exist in the current context Id(x => x.Id); Map(x => x.Name); Map(x => x.Tags); } } My bin folder has: Antlr3.Runtime.dll Castle.Core.dll Castle.DynamicProxy2.dll FluentNHibernate.dll Iesi.Collections.dll log4net.dll NHibernate.ByteCode.Castle.dll NHibernate.dll FluentNHibernate.pdb Castle.Core.xml Castle.DynamicProxy2.xml FluentNHibernate.xml Iesi.Collections.xml log4net.xml NHibernate.ByteCode.Castle.xml NHibernate.xml Any clue what I'm missing? Let me know if you need any more clarification.

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alphanumeric and special character sorting

- by Kaushik Gopal

Hi ppl, I wanted to know the different standards of sorting. To be more specific take the sample set: (Please note there's capitals, small letters, special characters, null values and numbers here) A a 3F Zx - 1Ad NULL How would the Oracle Database sort this by default? How would LINQ sort this by default? How would db2 sort this by default? (the following may get even more vague) How does the Windows platform sort this? (I mean say you have a couple of filenames, by default how would this get treated in a name sort) How does the *nix platform sort this? Is there some sort of standard for alphanumeric/special character sorting? The Windows operating system orders with numbers first, then alphabets. The Oracle database however treats alphabets first. I'm not sure of the *nix platform. It would be nice to have one place to know all these rules for the most common platforms (listed in questions above). Would the gurus throw some light on this topic? Cheers, K

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css: Cross-browser, reflowing, top-to-bottom, multi-column lists

- by Sai Emrys

See http://cssfingerprint.com/about#stats. See also http://stackoverflow.com/questions/933645/multi-column-css-lists. I want a multi-column list that: uses no JS reflows on window size makes as many columns as fit the enclosing element therefore, does not require batching the list into manual column groups works in all browsers works for an arbitrary number of unknown-width (but single-line-height) elements makes each column fit the width of its (dynamic) contents does not create scrollbars or other overflow issues is sorted top to bottom where possible My code is currently: ul.multi, ol.multi { width: 100%; margin: 0; padding: 0; list-style: none; -moz-column-width: 12em; -webkit-column-width: 12em; column-width: 12em; -moz-column-gap: 1em; -webkit-column-gap: 1em; column-gap: 1em; } ul.multi li, ol.multi li {  width: 20em; margin: 0; padding: 0; } Although this works okay, it has some problems: I have to guess the content width it is right-to-left in IE (though this is acceptable as a graceful degradation mode) it won't work at all in non-IE, non-Moz/Webkit/CSS3 browsers How can this be improved?

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Export to Excel from ASP.NET produces files unreadable with Excel Viewer

- by MainMa

Hi, I want to output some dynamic data from an ASP.NET website to Excel. I found that the easiest way which does not require to use Excel XML or to install Excel on server machine is to output data as a table and specify application/vnd.ms-excel type. The problem is when I do so and try to open the file in Excel Viewer, I receive the following error message: Microsoft Excel Viewer cannot open files of this type. Then nothing is opened. Even an easiest code such as: protected void Page_Load(object sender, EventArgs e) { Response.Clear(); Response.Buffer = true; HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=Example.xls"); Response.ContentType = "application/vnd.ms-excel"; StringWriter stringWriter = new System.IO.StringWriter(); HtmlTextWriter htmlTextWriter = new System.Web.UI.HtmlTextWriter(stringWriter); dataGrid.RenderControl(htmlTextWriter); Response.Write("<html><body><table><tr><td>A</td><td>B</td></tr><tr><td>C</td><td>D</td></tr></table></body></html>"); Response.End(); } produces the same error. What can cause such behavior? Is it because the Viewer cannot read such files, but full Excel version can?

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unable to get tooltip to work when usingjQuery load() content

- by user281867

Hi, I am having problem getting my tooltip to work when using the jQuery load() function. The tooltip works fine if i don't use load() to load external dynamic data. I googled and found the i may need to use live(), but I can't figure how to get it to work. Any suggestion? thank you!! Here is my scripts: function loadEMERContent(uid) { $("#ActionEWPNBook").load("ajaxLoadDATA.cfm?uid="+uid, null, showLoading); $("#EWPNBookloading").html(''); } function showLoading() { $("#EWPNBookloading").html(''); } function simple_tooltip(target_items, name){ $(target_items).each(function(i){ $("body").append(""+$(this).attr('title')+""); var my_tooltip = $("#"+name+i); $(this).removeAttr("title").mouseover(function(){ my_tooltip.css({opacity:0.8, display:"none"}).stop().fadeIn(400); }).mousemove(function(kmouse){ my_tooltip.css({left:kmouse.pageX+15, top:kmouse.pageY+15}); }).mouseout(function(){ my_tooltip.stop().fadeOut(400); }); }); } Here is my ajaxLoadDATA.cfm: Date Hours Modify Date #dateformat(vdate, "mm/dd/yyyy")##dateformat(vdate, "mm/dd/yyyy")# #hours# #dateformat(posted, "mm/dd/yyyy")# ACTIONS: Add Edit Cancel

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Finding most efficient transmission size in varying network latency scenarios

- by rwmnau

I'm building a .NET remoting client/server that will be transmitting thousands of files, of varying sizes (everything from a few bytes to hundreds of MB), and I'm curious about a general method for finding the appropriate transmission size. As I see it, there's the following tradeoff: Serialize entire file into a transmission object and transmit at once, regardless of size. This would be the fastest, but a failure during tranmission requires that the whole file be re-transmitted. If the file size is larger than something small (like 4KB), break it into 4KB chunks and transmit those, re-assembling on the server. In addition to the complexity of this, it's slower because of continued round-trips and acknowledgements, though a failure of any one piece doesn't waste much time. The ideal transmission method (when taking into account negotiation latency vs. failure rate) is somewhere in between, and I'm wondering about how to find out the best size for that particular client. Do I have some dynamic tuning step in my transmission that looks at the current bytes/second average, and then raises the transmission size until the speed starts to drop (failures overwhelm negotiation cost)? Or is there some other method for determining ideal transmission size? The application will be multi-threaded, so number of threads also factors in to the calculation. I'm not looking for a formula (though I'll take one if you've got it), but just what to consider as I create this process.

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