Data Controls :: Populate DataList Based On QueryString Value Throws Error When QueryString Is NULL Or Blank

May 7, 2015

The following code works well as long as I pass a querystring value to the datalist.

Private Sub BindGrid()
Dim id As Integer = Integer.Parse(Context.Request.QueryString("id"))
Dim strConnString As String = ConfigurationManager.ConnectionStrings("Conn").ConnectionString
Using con As New SqlConnection(strConnString)
Using cmd As New SqlCommand()
cmd.CommandText = "select Id, Name from tblFiles where Id=@Id"

[Code] ......

However, the page errors with the message "Value cannot be null." if I don't pass a value. I know that DataList does not have an EmptyItem Property like a Gridview control. I do not want the page to error if I don't pass a value. Need info to deal with empty values in a datalist.

Most websites have pointed me to this code to use:

<asp:Label ID="lblEmpty" Text="No Result" runat="server"

The 'list' throws an error. The error is "Too few type arguments to 'System.COllections.Generic.List". I am not sure if the code is written in C# and that is what is causing the error. It seems that it should work but I can not figure out the 'list' error.

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[Code] ....

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