VS 2008 / Confirmation Message Before Deleting In Grid?

Jun 21, 2011

i'm using this code;

Code:

Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim l As LinkButton = DirectCast(e.Row.FindControl("LinkButton1"), LinkButton)
l.Attributes.Add("onclick", "javascript:return " & "confirm('Are you sure you want to delete this record " & DataBinder.Eval(e.Row.DataItem, "CategoryID") & "')")
End If
End Sub

but i still encounter these errors:

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

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