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Message: [QUOTE="David Johnston, post: 4205589"] First, let me say I am relatively new to ASP.NET ... most .NET experience is with C# (Winforms). Now, I have a web page with a gridview that contains a checkbox control in a template field (see definition below): <asp:TemplateField ConvertEmptyStringToNull="False" HeaderStyle-CssClass="header" HeaderText="Select"> <ItemTemplate> <asp:CheckBox ID="chkSelectAgent" runat="server" OnCheckedChanged="chkSelectAgent_CheckChanged" /> </ItemTemplate> </asp:TemplateField> On the same page, I have a list box control. When the check box on a given row is clicked, I want to populate a row in the list box. My event handler is listed below: Public Sub chkSelectAgent_CheckChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkSelectAgent.CheckedChanged Dim sAgentId As String Dim sFirst As String Dim sLast As String Dim chkSelectedAgent As CheckBox Dim gvrSelectedAgent As GridViewRow If TypeOf sender Is CheckBox Then chkSelectedAgent = DirectCast(sender, CheckBox) If chkSelectedAgent.Checked Then gvrSelectedAgent = DirectCast(chkSelectedAgent.Parent.Parent, GridViewRow) sAgentId = gvrSelectedAgent.Cells(1).Text sFirst = gvrSelectedAgent.Cells(2).Text sLast = gvrSelectedAgent.Cells(3).Text lbSelectedAgents.Items.Add(sFirst + " " + sLast + " (Agent ID: " + sAgentId + ")") End If End If End Sub When I set a breakpoint in the event handler, it does hit the breakpoint, but only when I go to another page, not when I click in a check box. Do I need to set AutoPostBack="true" for the checkbox column? When I tried that, my page no longer renders. I'm guessing that is because I haven't handled the postback in the Page_Load subroutine. So, I have two questions: 1) Why isn't the event hander being fired when I click the checkbox? 2) If AutoPostBack is needed, why doesn't anything get rendered on the postback (not even labels and text boxes)? I have googled this like crazy and haven't found a definitive answer. If you have any good informational links, I not only want to solve the problem, but also to learn in the process. Thanks in advance for any help you can provide. [/QUOTE]

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