title: Error: Specified cast is not valid.
body: <p>I am getting the following error. Please help me</p>
  
  <pre><code>    Line 90:                 &lt;asp:TemplateField HeaderText="Notes"&gt;
  Line 91:                     &lt;ItemTemplate&gt;
  Line 92:                         &lt;asp:ImageButton ID="btnShowPopup" Text="Notes" Visible='&lt;%#Eval("notesVisible")%&gt;' runat="server" ImageUrl="~/Images/Imgs.jpg"
  Line 93:                             OnClick="Popup" /&gt;
  Line 94:                     &lt;/ItemTemplate&gt;
  </code></pre>