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• What design patterns are used in diagramming tools?

  - by TheMachineCharmer

  Diagram.net is good diagramming tool. I need to understand what design patterns are used by this tool so that I can understand how it works. What design patterns are used in this tool? What design patterns are generally used for diagramming tools? I would also like to know how can I use this to develop very simple diagramming tool (Only rectangular nodes and straight links). NOTE/Caution: I am doing this for FUN so please don't direct me to existing tools(I might down vote.. just kiddin ;).

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• How to prevent a dll from being loaded in other apps

  - by dhh

  Hello, currently I develop a C#.Net application in which I'm using a custom control I developed some time ago. I need the dll to be shipped within the new application - but understandably I do not want the dll file to be used for foreign apps. That's why I need the custom dll to be somehow compiled within the new application. Currently the dll is copied into the application directory. Any ideas? Should be trivial imho. Thanks & regards, Daniel

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• Bind handler to Ajax Sys.Component.propertyChanged event

  - by Steven Chalk

  "When you create a client component class, you define the properties that you expect page developers to access. You can also raise Sys.Component.propertyChanged notification events in the set accessors for properties of your component. Page developers who use the component can bind the property notification event to their own handler to run code when the property value changes." From http://www.asp.net/AJAX/Documentation/Live/tutorials/DefiningBindableClientComponent.aspx Does anyone know how to bind a handler to a property changed event when raised from a property accessor. Looked for ages but cannot find an example anywhere showing how you would do this.

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• Page containing Microsoft Chart Control returns Service Unavailable

  - by MHinton

  I have a frustrating problem with an asp.net mvc view containing the Microsoft Chart control. When I request the view containing the control I get the following error. Service Unavailable HTTP Error 503. The service is unavailable. When I run the project under the visual studio 2008 dev server it works fine. When I deploy the project to the staging server I get the error. To make this even more frustrating when I deploy to a different site on the same server under a virtual directory it works. I also get no error messages in the event log or elmah when this happens. Has anyone else encountered this? What did you do to resolve it?

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• Image Uploading - security issues

  - by TenaciousImpy

  Hi, I'm developing an ASP.NET Web app and would like the user to be able to either upload an image from their local system, or pass in a URL to an image. The image can either be a JPG or PNG. What security issues should I be concerned about doing this? I've seen various ways of embedding code within JPG files. Are there any methods in C# (or external libraries) which can confirm that a file is a JPG/PNG, otherwise throw an error? At the very least, I'm making the directory which holds uploaded images non-browsable and putting a max size limit of 1mb, but I'd like to implement further checks. Thanks for any advice.

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• Problem with View - it does not refresh after db update

  - by crocodillez

  Hi, I am working with small ASP.NET MVC project - online store. I have addToCart method which adds selected product to cart - it updates cart table in my db and showing cart view with its content. But I have problems. While db is updating correctly the view does not. I see that quantity of the product in my db is incremented correctly but quantity in view is not changed. I have to stop debugging my app in visual studia and restart it - then my view is showing correct data. What can be wrong?

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• Methods for content uniqueness calculation on C#

  - by sashaeve

  I have a set of text files. I want to calculate a content uniqueness for different subsets. E.g. we have 10 documents (A1 - A10) and want to calculate the uniqueness for subset of documents A1 and A2. So the result must be some value from 0 to 1 (1 - absolutely unique content, 0 - absolutely dublicated content). What methods for content uniqueness calculation do you know? Please suggest these methods with .NET implementations. Thanks.

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• Add columns to SqlWebEventProvider

  - by Julien N

  In an asp.net application, we'd like to use the SqlWebEventProvider to log any Event that occurs during the application lifetime. The problem is that we think that the table aspnet_WebEvent_Event doesn't provide enough columns and should log more information (we need to keep the Logged user). I'm aware that this information could be stored in the "Details" column but it wouldn't then be really simple to filter the results and build reports. So I'm searching for a simple solution to add a column. I wish I could derive SqlWebEventProvider but the methods used to build the stocked procedure parameters are private (PrepareParams() and FillParams()). Any simple solution that doesn't imply to rewrite the entire Provider class ?

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• Preserve onchange for a dropdown list when setting the value with Javascript.

  - by Zac Altman

  I have a dropdown list with a piece of code that is run when the value is changed: <select name="SList" onchange="javascript:setTimeout('__doPostBack(\'SList\',\'\')', 0)" id="SList"> Everything works fine when manually done. As an option is selected, the onchange code is called. The problem begins when I try to change the selected value using a piece of Javscript. I want to be able to automatically change the selected option using JS, whilst still having the onchange code called, exactly as if done manually. I try calling this: form.SList.value = "33"; The right option is selected, but the onchange code does not get called. So then I try doing this: form.SList.value = "33"; javascript:setTimeout('__doPostBack(\'SList\',\'\')', 0); The right value is not selected and nothing happens. FYI, the code is done in ASP.NET and Javascript. What can I run to change the selected option whilst still calling the onchange code?

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• Document.ready() failing on popup

  - by Seth Duncan

  I am using ASP.Net and jQuery/jQuery UI and I am trying to use the datepicker control. It works fine on every page, except when I have to use the popup (to add new data into the database and then i refresh the current page to reflect the new data being entered). It seems that document.ready() is failing when I use the popup. I can invoke the datepicker control manually with adding a click event to fire off the showcalendar function, however I want to try and make it work. Does anyone have any ideas of why a popup would fail document.ready() ? Thanks!

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• Best way to hide a window from the Alt-Tab program switcher?

  - by chaiguy1337

  I've been a .NET developer for several years now and this is still one of those things I don't know how to do properly. It's easy to hide a window from the taskbar via a property in both Windows Forms and WPF, but as far as I can tell, this doesn't guarantee (or necessarily even affect) it being hidden from the Alt-Tab dialog. I've seen invisible windows show up in Alt-Tab, and I'm just wondering what is the best way to guarantee a window will never appear (visible or not) in the Alt-Tab dialog. Update: Please see my posted solution below. I'm not allowed to mark my own answers as the solution, but so far it's the only one that works. Update 2: There's now a proper solution by Franci Penov that looks pretty good, but haven't tried it out myself. Involves some Win32, but avoids the lame creation of off-screen windows.

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• Show different sub-sets in edit view

  - by Martin R-L

  In the context of C# 4, ASP.NET MVC 2, and NHibernate; I've got the following scenario: Let's assume an entity Product that have an association to ProductType. In a product edit view; how do I implement that only a sub-set of the product's properties are shown in an elegant and DRY way? Use a product view model builder, and from different view models automagically generate the view with my own Html.EditorForModel() (including drop-downs and other stuff not out-of-the-box)? Attribute the properties of one view model and use the Html.EditorForModel() way aforementioned? Use one model, but implement different web controls (view strategies) (can it be done DRY?)? Something else entirely?

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• Howto allow "Illegal characters in path" ?

  - by hbruce

  I have a MVC.NET application with one route as follows: routes.MapRoute("member", "member/{id}/{*name}", new { controller = "member", action = "Details", id = "" }, new { id = @"\d+" }); Thus, a link could be something like this: http://domain/member/123/any_kind_of_username This works fine in general but if the path contains illegal characters (e.g. a double qoute: http://domain/member/123/my_"user"_name) I get a "System.ArgumentException: Illegal characters in path." After much googling the best suggestions seems to be to make sure that the url doesn't contain any such characters. Unfortunately, that is out of my control in this case. Is there a way to work around this?

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• How to make Databinding type safe and support refactoring

  - by Ian Ringrose

  When I wish to bind a control to a property of my object, I have to provide the name of the property as a string. This is not very good because: If the property is removed or renamed, I don’t get a compiler warning. If a rename the property with a refactoring tool, it is likely the data binding will not be updated. I don’t get an error until runtime if the type of the property is wrong, e.g. binding an integer to a date chooser. Is there a design-paten that gets round this, but still has the ease of use of data-binding? (This is a problem in WinForm, Asp.net and WPF and most likely lots of other systems) I have now found "workarounds for nameof() operator in C#: typesafe databinding" that also has a good starting point for a solution.

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• linq to sql dynamic data modify object before insert and update

  - by Dan Tanner

  I'm using Dynamic Data and LINQ to SQL for some admin pages on a .NET 3.5 web app. All my admin tables a CreatedBy, CreatedDate, UpdatedBy, and UpdatedDate. I'm looking for a way to inject the setting of these properties before the objects are inserted and updated. I've seen an object_inserting hook if you have a linq to sql datasource in the web form, but I'm using dynamic data...is there an easy way to generically set that? And I've also looked at modifying each of the partial classes for my admin objects, but the closest hook I see is to implement the OnValidate method with the Insert action. Any suggestions? TIA.

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• Edit a video to embed a bitmap.

  - by Rajkumar R

  I would like to edit a video so that i can embed a small bitmap image at any corner. The bitmap image has to be replaced with another image, for every two video frames. If somehow it is possible to covert a group of pictures into slideshow video then i want that video to be embedded at the corner of the main video. The size of the bitmap is about the size of a channel logo and that is exact space it will occupy in the video. Please guide me in accomplishing. Is there any existing libraries available to do this. I am working on .Net 4 platform but i do

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• html-login form not working

  - by codymanix

  I have a child page LoginContent.aspx which contains a login form. If the user logs in he should be redirected to my Welcome.aspx page. But if I press the login button the page just reloads itself, nothing happens. The codebehind on this page is empty. Both LoginContent.aspx and Welcome.aspx are child forms of the same master page. <form method="post" action="~/Welcome.aspx"> Username: <input type="text" name="username" size="15" /><br /> Password: <input type="password" name="passwort" size="15" /><br /> <input type="submit" value="Login"/></p> </form> I know I could use the asp.net login control but I want more control over things.

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• How do I assign a value to a MailMessage ReplyTo property?

  - by Zack Peterson

  I want to set the ReplyTo value for a .NET MailMessage. MailMessage.ReplyTo Property: ReplyTo is obsoleted for this type. Please use ReplyToList instead which can accept multiple addresses. MailMessage.ReplyToList Property: Gets or sets the list of addresses to reply to for the mail message. But, ReplyToList is ReadOnly. I've tried to use the MailMessage.Headers property like this: mail.Headers.Add("Reply-To", "[email protected]"); as described here: System.Web.Mail, OH MY! But, that doesn't seem to work. How do I set the value(s) of the MailMessage's ReadOnly property ReplyToList?

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• Separation of concerns and authentication

  - by Tom Gilder

  I'm trying to be a Good Developer and separate my concerns out. I've got an ASP.NET MVC project with all my web code, and a DAL project with all the model code. Sometimes code in the DAL needs to check if the current user is authorized to perform some actions, by checking something like CurrentUser.IsAdmin. For the web site, the current is derived from the Windows username (from HttpContext.Current.User.Identity), but this is clearly a web concern and shouldn't be coupled to the DAL. What's the best pattern to loosely couple the authentication? Should the DAL be asking the MVC code for a username, or the MVC be telling the DAL? Are there advantages or disadvantages to one or the other? Thank you!

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• Distribute EXE without config file (Webservice in WinForm)

  - by Marc vB

  I have created a WinForm app (VB.NET 2008) that references to a webservice which was added via "Add Service Reference". The app works ok. Question is about distribution of the app. It looks like I need to install the app's config file with the EXE, however I don't want that because the config files shows the actual url of the web service which is not whatt I want. So, is it possible to use a webservice in a WinForm app and only have to install the resulting EXE?

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• ListChildren SQL Reporting Service

  - by markpirvine

  Hi, I'm trying to get a list of available reports via the webservice for SQL Reporting Services 2005 express edition. Each time I try to call the ListChildren method I get an insuffient permission exception. The code is: ReportingService2005SoapClient rService = new ReportingService2005SoapClient(); CatalogItem[] cItems = null; rService.ListChildren("/", false, out cItems); I added the ASP.net (iusr) account into the local admin group on the PC and still get the exception. Is this method supported in the express edition? Mark

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• Verify windows log-in via smart card

  - by Ronen Rabinovitz

  Hi I need to verify in my WPF application if the user log in to his computer via password or via smart-card. Both login options are available in my company clients but my application need to open only in the smart-card login. All the clients are windows 7 OS. I look at some sites: http://technet.microsoft.com/en-us/library/ff404285(v=ws.10).aspx http://www.codeproject.com/Articles/240655/Using-a-Smart-Card-Certificate-with-NET-Security-i and I'm thinking I need to get the enhanced key usage (EKU) attribute field. If the EKU is empty = then the user was loged via password and not via smartcard. I only need this simple check, I do not care for creating/validations on certificates atc.

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• JQuery $.getJSON appends a question mark to the request URL

  - by David Neale

  I have the folliwng JSON request code on an ASP.NET MVC web application: var userID = 'id=' + $('#namesList').val(); $.getJSON('/Person/GetPerson/', userID, function(data) { $('#collar').text(data.collarNumber); $('#name').text(data.Name); $('#email').text(data.EmailAddress); }); This creates a request such as: http://localhost:48610/Person/GetPerson/?id=6. Why is there a question mark in there? I get the server error The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'.... If I make the request manually without the question mark it works fine.

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• How can you increase timeout in Linq2Entities?

  - by Russell Steen

  I'm doing a basic select against a view. Unfortunately the result can be slow and I'm getting timeout errors intermittently. How can I increase the timeout? Using .NET 3.5, Sql Server 2000, Linq2Entities I'm using the very basic query List<MyData> result = db.MyData.Where(x.Attribute == search).ToList(); Fixing the query so that it's faster on the DB side is not an option here. Exact Error: "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding." Update: I'd prefer to just change it for this one query.

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• Secondary Domain Adds Extra Folder in URL during Postbacks

  - by Joshua

  My ASP.NET Website (C#, 3.5 framework, IIS7) is hosted at GoDaddy. There are multiple sites on the account. Currently when I perform postbacks or Response.Redirects on a secondary web site, the following URL appears in the address bar: www.mywebsite.com/webfolder/default.aspx Where the "webfolder" is the sub-directory on the server where the web site is hosted (i.e. SeverRoot/webfolder). The site seems to work with or without the folder in the URL. Is there a way to remove the folder from the URLs during postback? I think I have to use URL Rewriting (which GoDaddy supports using Microsoft's Rewrite Module) but I'm not sure how.

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