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• Dynamic UI vs Static UI

  - by Damien

  I've been wondering, at what point should I give up the convenience of a static data entry form with designer support for a dynamic UI which removes a lot of code duplication? There seems to be a conflict in the programming world where people constantly try to remove code repetition to improve maintainability and yet when it comes to forms, that all goes out of the window and everything gets added explicitly to the forms. What signs should I look for to know when it's time to leave the designer in the dust and create a dynamic UI?

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• HttpServerUtility.UrlTokenDecode fails "sometimes" (Invalid length for a Base-64 char array.)

  - by Josef

  We have an IHttpHandler for stylesheets and add a <link/> tag to the page like this: HtmlGenericControl link = new HtmlGenericControl("link"); link.Attributes.Add("rel", "stylesheet"); link.Attributes.Add("href", "stylesheet.axd?d=" + HttpServerUtility.UrlTokenEncode(token)); head.Controls.Add(link); In the stylesheet.axd handler, we UrlTokenDecode the d query string parameter like this: var token = HttpServerUtility.UrlTokenDecode(Request.QueryString["d"]); This works most of the time but every now and then we find one of the following two exceptions in our log: [FormatException: Invalid character in a Base-64 string.] System.Convert.FromBase64CharArray(Char[] inArray, Int32 offset, Int32 length) System.Web.HttpServerUtility.UrlTokenDecode(String input) ... [FormatException: Invalid length for a Base-64 char array.] System.Convert.FromBase64CharArray(Char[] inArray, Int32 offset, Int32 length) System.Web.HttpServerUtility.UrlTokenDecode(String input) System.Web.HttpServerUtilityWrapper.UrlTokenDecode(String input) ... Any ideas what would cause this phenomenon? Remarks: the resulting URL is < 1500, so below any known URL limits (e.g. IE: 2083) seems to be independent of user agent (we have these exceptions for IE6,7,8, FF & Chrome) our (unconfirmed) suspicions include AntiVirus products, HTTP proxies, browser addons found this remotely related question, but it's about a viewstate issue

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• .net/iis6 Limitations of the urlMappings in web.config for extensionless url rewriting

  - by ScottE

  I'm investigating a simple url rewriting setup for iis6 / net 2.0 sites. I've added a . wildcard mapping in IIS that points to the .net executable. I'm also using the urlMappings element in the web.config to add some rewritting urls. I've moved the config outside of the web.config so I can make changes to the list without forcing application restarts, like so: <urlMappings configSource="config\urlMappings.config"> </urlMappings> I'd like to allow our content management to add urls to this file so that we can have extensionless friendly urls. <add url="~/someurl" mappedUrl="index.aspx?page=123" /> This works just fine, but I'm concerned about limitations in the number of entries that I can map in the urlMappings config. I can't seem to find any documentation on this. Has anyone found any limitations? Thanks.

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• jQuery - Image management

  - by kape123

  Is there a jQuery plug-in / JavaScript control that will allow me to display array of images, but with (at least) option to delete image on certain user action. Something like this: http://www.gmarwaha.com/jquery/jcarousellite/index.php but with dedicated delete button on every image. First extra option that I can think of is to rearrange order of images. If not... I guess I'll start extending mentioned jcarousellite myself....

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• Caching and cache invalidation in user controls?

  - by Rishabh Ohri

  HI, In our .aspx pages we have many user controls. each user control executes a sql query. The caching mechanism to be followed is to fragment cache each user control on the page and add the query dependency to the respective queries of the user controls. How to achieve query dependency on fragment cached data for invalidation?

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• How to deployed Mvc Application on shared-hosting Server?

  - by ricky roy

  hi, I My Web site on a HELM Control Panel. I developed my web site on MVC.But My Hosting Provider having a Following components installed on That Hosting Account framework 3.5 and IIS6. But I am Unable to Run My site it display me Page not found error.

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• Windows/.NET Load Distribution & Balancing

  - by andrewbadera

  Hi all, Is there a vetted Windows-friendly, or even .NET-native, load-distributing/load-balancing utility out there along the lines of HA Proxy? We have a .NET stack product, and the one piece that we step out of the stack is for load-balancing. We need something with configurable rules for distribution -- perhaps subdomain-driven -- that NLB alone doesn't seem to offer. If it integrates directly with .NET, or offers an exposed API callable by webservices, so much the better! Thanks in advance! Clarification: we need to logically part over boxes. This is not just a cluster/failover/replication scenario.

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• set label value in vb.net

  - by julio

  Hi-- I'm usually a PHP guy but got stuck doing a project in vb.net. I have a query (sqldatasource) that returns a single value (the last update date). I want to use a label to say something like "Last updated: " < Label = (returned value) In PHP this would be simple. In vb.net, all I can find are endless badly written code behinds showing how you'd execute the query onLoad then bind it to the label. Is this really the only way to do this? It seems like a ridiculously simple problem to have such a long solution. I have used a datagrid control to just bind the query result directly, but it prints the column name as well as the date, so it's not ideal. Any ideas?

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• how to send a dynamic set of parameters to webmethod using jquery ajax method?

  - by kranthi

  hi, I am using jquery ajax method on my aspx page,which will invoke the webmethod in the code behind.Currently the webmethod takes a couple of parameters like firstname,lastname,address etc which I am passing from jquery ajax method using data:JSON.stringify({fname:firstname,lname:lastname,city:city}) now my requirement has been changed such that,the number and type of parameters that are going to be passed is not fixed for ex.parameter combination can be something like fname,city or fname,city or city,lname or fname,lname,city or something else.So the webmethod should be such that it should accept any number parameters.I thought of using arrays to do so, as described here. But I do not understand how can I identify which and how many parameters have been passed to the webmethod to insert/update the data to the DB.Please could someone help me with this? thanks

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• .aspx character coding

  - by kwek-kwek

  I am having an problem. First time working with a windows server, do you know if there is any problem in character coding? My document is set to content="text/html; charset=UTF-8" but it's giving me funny words... you can check it here. This site is a pure HTML with few includes but anything else is just HTML. I can convert them to HTML entities but that is basically wasting my time. I never had this problem with any website I did except for this. Some others said "The problems seems to be that you have converted the text into utf-8 twice.". But how would Coverted it twice since dreamweaver should convert it for me but in this case it doesn't.

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• Is there a way to use sharepoint as the back-end versioning and storage for my custom document manag

  - by Aaron Palmer

  I want to build a custom document management web application that ties in with sharepoint for the actual document versioning and storage. I'm hoping for something like a sharepoint widget that I can plug into my web application that would allow me to tie in with sharepoint and download documents, make edits to them, and upload them back to sharepoint, with sharepoint handling all of the versioning and storage. If WSS is the answer to this, are there licensing issues that I need to consider? Thanks.

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• Problem with Efficient Gridview paging without datasource control

  - by Ronnie Overby

  I am trying to do efficient paging with a gridview without using a datasource control. By efficient, I mean I only retrieve the records that I intend to show. I am trying to use the PagerTemplate to build my pager functionality. In short, the problem is that if I bind only the records that I intend to show on the current page, the gridview doesn't render its pager template, so I don't get the paging controls. It's almost as if I MUST bind more records than I intend to show on a given page, which is not something I want to do.

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• C# -Closure -Clarification

  - by nettguy

  I am learning C#.Can I mean closure as a construct that can adopt the changes in the environment in which it is defined. Example : List<Person> gurus = new List<Person>() { new Person{id=1,Name="Jon Skeet"}, new Person{id=2,Name="Marc Gravell"}, new Person{id=3,Name="Lasse"} }; void FindPersonByID(int id) { gurus.FindAll(delegate(Person x) { return x.id == id; }); } The variable id is declared in the scope of FindPersonByID() but t we still can access the local variable id inside the anonymous function (i.e) delegate(Person x) { return x.id == id; } (1) Is my understanding of closure is correct ? (2) What are the aditional advantages can we get from closures?

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• RadioButtonList.SelectedIndex vs RadioButtonList.SelectedValue

  - by Pinpin

  Out of curiosity, anyone knows the particulars of the internal implementation of ListControl.SelectedIndex = (int) <new valueIndex> VS ListControl.SelectedValue = <new value>.ToString() I'm having difficulties with a custom validation object we've built here to process all validation in one sweep. I suspect using <SelectedValue = > will raise a SelectedIndexChanged event, even though both the value and index remain the same, both before and after the operation. (The ListControl's values are populated declaratively....) As ever, thank you for your time!

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• IValidator.Validate method and adding error message to a custom type

  - by user102533

  I have several server controls that implement the IValidator interface. As such, they have their own Validate() methods that look like this. public void Validate() { this.IsValid = true; if (someConditionFails()) { ErrorMessage = "Condition failed!"; this.IsValid = false; } } I understand that these Validate() methods are executed on postback before the load completed event that is executed before the save button's event handler. What I would like to do is pass in a reference to an instance of a custom class that collects all the error messages that I can access from Save button event handler. In other words, I would like to do something like this: public void Validate(ref SummaryOfErrorMessages sum) I guess I can't do this as the signature is different from what the IValidator interface has. The other option I can think of is on Load Completed event, I would iterate through all the validators on page, get the ones with IsValid = false and create my SummaryOfErrorMessages there. Does this sound right? Is there a better way of doing it?

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• How do I get ELMAH to work with SQL Server (permission problems)

  - by Gary McGill

  I've got ELMAH working on my (Cassini) development server, and was quite happy with it, but now that I'm trying to move everything to my production server (IIS7), the honeymoon looks like being over. I've got past the "gotcha" with IIS7, which frankly could have been better highlighted in the documentation, and if I just use the in-memory log then it works. However, I'm trying to get it to use the SQL Server log (as I do on my development system), and I'm getting an error along the lines of: The EXECUTE permission was denied on the object ELMAH_GetErrorsXml Well, fine. I know how to grant database permissions, but I'm really struggling to understand which user and which stored procs/tables I need to grant access to. The thing that's really confusing me is that I didn't have to do anything like this to get it to work on my development server. The only difference I can see is that on my development server it seems to connect as NT AUTHORITY\IUSR, whereas on my production server it seems to connect as NT AUTHORITY\NETWORK SERVICE. (It's just using a trusted connection so I've not explicitly configured it to do that - I presume it's to do with the web server). UPDATE: I've since established that because I'm using Cassini, it was actually logging in as me (an admin) and not IUSR, which explains why I didn't get any permission problems. On my development server, the IUSR account is a member of the public database role, and has access to the required database (again as "public"). There's no explicit granting of object-level permissions. [See update above - this is irrelevant]. On my production server, I've added NETWORK SERVICE in exactly the same way (public database role, explicit access to the database as "public"). Yet, I get this permission error. Why?!! [See update above - the only reason I don't get a permission error is because I'm running as an admin]. And, of course, if the fact that it works locally is just "luck", I will need to know which SPs/tables to grant access to. My guess would be all 3 SPs and not the table, but it would be good (again) to see some documentation that makes this explicit.

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• How can I limit access to a particular class to one caller at a time in a web service?

  - by MusiGenesis

  I have a web service method in which I create a particular type of object, use it for a few seconds, and then dispose it. Because of problems arising from multiple threads creating and using instances of this class at the same time, I need to restrict the method so that only one caller at a time ever has one of these objects. To do this, I am creating a private static object: private static object _lock = new object(); ... and then inside the web service method I do this around the critical code: lock (_lock) { using (DangerousObject do = new DangerousObject()) { do.MakeABigMess(); do.CleanItUp(); } } I'm not sure this is working, though. Do I have this right? Will this code ensure that only one instance of DangerousObject is instantiated and in use at a time?

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• Background text in textbox

  - by Geetha

  Hi All, I want to display a background text in the textbox. ex: The Title textbox in the stackoverflow Ask question page. Needs: If i enter some text inside the textbox it should disappear. Geetha.

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• monitor table in data base

  - by hatem gamil

  hi all i want to make a web site to act as a monitor to a certain table in data base or act as a listenter on that table eg lets say i have table employees i want to make a web page that listen to changes occurs on that table (all DML operations) whenever a record is inserted i want this page alert me that a "1 row is inserted in table employee",or updated i want to get an alert " row number xx is updated" and so on so what is the best practise to do so thnx

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• Prevent Postback in array of linkbutton is created at dynamically

  - by Khilen

  i have created Array of Linkbutton and when user click on link button it will create an array of Radio Buttons but it requires Postback all time so page load takes more time... what is solution of it??

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• Format boolean column in MVCContrib grid

  - by Ghecco

  HI, I am using the MVCContrib grid and I would like to display images depending on the values of a column, e.g.: if the column's value is null display the image "<img src="true.gif">" otherwise display the image "<img src="false.gif"> Furthermore I would also need (this should be the same approeach I think) to display different actions depending on the column's/rows' value ... Thanks in advance for your answers! Best regards Stefan

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• Convert C# event handling to VB.NET

  - by Quandary

  Question: The following C# code: public event RemoteAPI.NotifyCallback Notify { add { s_notify = value; } remove { Console.WriteLine("TODO : Notify remove."); } } How do I convert this to VB.NET ? It implements an interface: Public Interface ICallsToServer ''' <summary> ''' Function to call the server from the client ''' </summary> ''' <param name="n">Some number</param> ''' <returns>Some interesting text</returns> Function SomeSimpleFunction(ByVal n As Integer) As String ''' <summary> ''' Add or remove callback destinations on the client ''' </summary> Event Notify As NotifyCallback End Interface The VB.NET automatically generated code was: Public Event Notify(ByVal s As String) Implements RemoteAPI.ICallsToServer.Notify

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• How can i redirect unauthorized user to a login page

  - by Joby Kurian

  I have myown login page.If any user access any page directly(without login),i want to redirect unauthorized user to login page....How it possible.....Using Generic Handler is there any chance? or how can i do it ?

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• Button click doesn't call function even when button attribute OnClick is set to that function

  - by Silmaril89

  Hi, I have an aspx page with two buttons, one of the buttons has an OnClick attribute to a function that should be run when clicked. When the other button is clicked there is an if statement checking if the page is a postback, if it is then I run some statements that need to be run when that button is clicked. That postback button works fine. However, the other button, when it's clicked the function it's supposed to call never executes, and the statements inside if (Page.IsPostBack) get executed instead. What can I do to fix this? Is there a way to make the button that calls a function not do a Post back?

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• Can I use loops in repeater? Is it reccomended?

  - by iTayb

  My datasource has an Rating dataItem contains an integer from 0 to 5. I'd like to print stars accordignly. I'm trying to do it within Repeater control: <b>Rating:</b> <% for (int j = 1; j <= DataBinder.Eval(Container.DataItem, "Rating"); j++) { %> <img src="App_Pics/fullstar.png" /> <% } for (int j = 1; j <= 5 - DataBinder.Eval(Container.DataItem, "Rating"); j++) { %> <img src="App_Pics/emptystar.png" /> <%} %> I get the error The name 'Container' does not exist in the current context. It is weird, because when I used <%# DataBinder.Eval(Container.DataItem, "Name")%> a line before, it worked great. Is it clever to include loops in my aspx page? I think it's not very convenient. What's my alternatives? What's that # means? Thank you very much.

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