ASP.NET Add Command Argument to Button in Code Behind

Question

I am trying to grab an argument added to an asp:button in code behind, but getting error:

Unable to cast object of type 'System.EventArgs' to type 'System.Web.UI.WebControls.CommandEventArgs'

This button is part of a normal form, not a gridview, etc..

What might I be doing wrong? Regards.

<form><asp:Button ID="btnPrint" runat="server" Text="Print" CommandArgument="" /></form>

Imports System.Web

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim String AS String = "MyValue"
    btnPrint.CommandArgument = String

End Sub    

Protected Sub btnPrint_Click(ByVal sender As Object, ByVal e As CommandEventArgs) Handles btnPrint.Click


     Dim ID as String = e.CommandArgument.toString

     'Have also tried
      'Dim btn As Button = sender
      'Dim ID As String = btn.CommandArgument

      Response.Redirect("Print.aspx?tid=" & ID)

End Sub

McGarnagle · Accepted Answer · 2013-10-21 18:23:11Z

2

You just need to update btnPrint_Click to handle the Command event instead of "Click":

Protected Sub btnPrint_Click(ByVal sender As Object, ByVal e As CommandEventArgs) Handles btnPrint.Command

answered Oct 21, 2013 at 18:23

McGarnagle

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Comments

Steve · Accepted Answer · 2013-10-21 18:23:52Z

0

My ASP button click events look like this:

Private Sub SearchASPxButton_Click(sender As Object, e As EventArgs) Handles SearchASPxButton.Click

Notice the second parameter is of type System.EventArgs. Did you change the type of the automatically generated click event? Or did you create this manually yourself?

answered Oct 21, 2013 at 18:23

Steve

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2 Comments

user1457613 Over a year ago

Is this 'Handles SearchASPXButton.Click' Correct? I am getting error 'requires WithEvents variable'

Steve Over a year ago

Thats the name on my control, not yours. Looks like you wanted the Command event anyways, not the click event.

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