title: The GridView fired event PageIndexChanging which wasn't handled
body: <p>i have allowed paging and added the below codes but got the error. Does anyone know what could be the problem?</p>
  
  <p>Code:</p>
  
  <pre><code>  protected void SubmitAppraisalGrid_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
      {
          SubmitAppraisalGrid.PageIndex = e.NewSelectedIndex;
          SubmitAppraisalGrid.DataBind();
  
      }
  </code></pre>
  
  <p>Design:</p>
  
  <pre><code>&lt;asp:GridView ID="SubmitAppraisalGrid" runat="server" 
                  AutoGenerateColumns="False" BorderWidth="0px" 
                  onrowcreated="SubmitAppraisalGrid_RowCreated" ShowHeader="False" 
                  style="margin-right: 0px" AllowPaging="True" PageSize="1" 
                  onselectedindexchanging="SubmitAppraisalGrid_SelectedIndexChanging"&gt;
                 &lt;/asp:GridView&gt;
  </code></pre>