Trying to use linq on simple database.

Hello,
 
I'm new to asp.net and I'm now trying to use linq to do my queries.  
I'm trying to use the automatic update and delete buttons and it doesn't seem to work...
Here's my code:

<asp:UpdatePanel ID="upHelpRequests" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional">
    <ContentTemplate>
      <ajaxToolkit:ModalPopupExtender ID="mpeHelpRequests" runat="server"
        TargetControlID="ButtonHelpRequests"
        PopupControlID = "pnHelpRequests"
        BackgroundCssClass="ModalPopupBack"
        CancelControlID="ButtonCancelHelpRequest"
     &nb ...