<div id="FilterForm">
 <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
     <table style="width: 100%">
         <tr>
             <td style="width: 168px">
                 <asp:Label ID="Label1" runat="server" style="font-weight: 700" 
                     Text="Временной период:"></asp:Label>
             </td>
             <td style="width: 170px">
                <asp:TextBox ID="InvoiceDateTextBox" runat="server" Height="18px" Width="166px"></asp:TextBox>
                <asp:calendarextender ID="CalendarExtender1" runat="server" 
                    PopupButtonID="Image1"
                    TargetControlID="InvoiceDateTextBox" />
             </td>
             <td style="width: 75px">
                <asp:ImageButton ID="Image1" runat="Server"
                     ImageUrl="~/Images/imgCalen.png" Height="18px" ImageAlign="Middle" Width="18px" />
                </td>
             <td style="width: 46px">
                  </td>
             <td>
                  </td>
         </tr>
.....