Binding to DropDownList problems

i'm having problems binding to the DropDownList control. Here's my code:


and here's my code behind (Page_Load event handler):

CODEDim lstCategoryID As DropDownList = CType(FormView1.FindControl("lstCategoryID"), DropDownList)

lstCategoryID.DataSource = Utilities.GetCategoriesList()
When i run the application i get the error:

'lstCategoryID' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

This seems a strange error since there is a value in the DropDownList which is the same as the value i am trying to bind to. I think it might be something to do with me loading in the contents of the DropDownList with the Page_Load event handler (since i have had no problems with dropdownlists with static options). I have also tried putting in the Page_Init event handler but this did not work either.

Appreciate if someone could help.

Posted On: Wednesday 2nd of January 2013 12:50:52 AM Total Views:  154
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I have a simple label control that I need to display in a ASP.NET application and I need to get the label to display in a red colored font. I have tried the following code several times and the text of the label will not change to red, it still displays as black text: (The code is within a table tag.)Total Man Hours: Some one else programmed the application that I'm working with in ASP.NET. I just just changed the .aspx web page on in notepad and then just did a copy and replace but the code did not work. Do I need to reboot either just IIS or reboot the server that this application is located on to get the change in code (I added the ForeColor attribute.) to work and turn the text Total Man Hours to redAny assistance would be greatly appreciated.
Response.Redirect() to open new browser window....   (264 Views)
I'm hoping this is a simple problem...I tend to make use of Response.Redirect to navigate between pages within my web application.In a few instances I want to be able to navigate to a different page - but in the scope of a new browser window.How can I do thisI want this to happen when the user clicks a standard asp button control.I'm using ASP.NET with C# code
Need to know the entire Sowftware developement cycle   (145 Views)
Hi Everyone.I am excited to know the entire software development lifecycleof .net .I mean how it goes in a proper company.Are there any websites which provide this info in detail.Please reply if any one knows
Enumerator (newbie question)   (213 Views)
I'm trying to understand what an Enumerator is..Is it similar to defining user-defined data typesThis is what msdn says:"Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection.
ASP Discussion Forum Software with AD authentication   (228 Views)
I'm hoping to establish a simple forum/bb on our intranet and I was hoping to have users automatically authenticated. Can anyone point me in the direction of discussion forum/bulletin board software that is built to use AD-integrated authenticatio
Write ID3 Properties to an MP3 file on the server   (204 Views)
Does anyone know a way to alter the ID3 attributes of a mp3 via .NET These properties are read/write so I'm thinking there should be some way of accomplishing this...