How to bind gridview data on model pop up extender?

Hi friends ..i want to bind the gridview data on popup extender..when i clicking button the gridview should bind the data with model popup extender..i tried but it doesn't bind the data..only model pop up window are displayed..can any one help me out..
Here is my code...

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

	CellPadding="4" ForeColor="#333333" Visible="true" GridLines="None" Width="617px">                                                                                           Present   Absent     <%--   --%>       <%--           --%>
								Font-Bold="True" Font-Names="Verdana" Text="Submit" Width="91px" OnClick="Button1_Click" />

 

cs code;

protected void Button1_Click(object sender, EventArgs e)
  {
  bind();
  }
public void bind()
  {
  try
  {
  Con.Open();

  Sdap = new SqlDataAdapter("select T_Id,[Name],Class,Section from student where Section='" + DropDownList1.SelectedItem.ToString() + "'", Con);
  DataSet Ds = new DataSet();
  Sdap.Fill(Ds);
  GridView1.DataSource = Ds;
  GridView1.DataBind();
  }
  catch (Exception Ex)
  {
  Response.Write(Ex.ToString());
  }
  finally
  {
  Con.Close();
  }
  }