populate gridview in a contentplaceholder with sql result from Button event contained in a web form user control[.ascx]

  This is the Web form user control code? which contains the design view for a form to search available routes in a database     +++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++          <h3>Depart From: </h3>             <asp:Label ID="LblCountryDpt" runat="server" Text="Country: "></asp:Label><br />             <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" DataSourceID="SqlDataSource2" ...