get the seleted date in ajax control

hi

how to get the selected date  from

 <tr>
               <td>
                Select Date
               </td>
               <td align="left">
                  <asp:TextBox ID="txtdate" runat="server"></asp:TextBox>
                   
                <cc1:CalendarExtender ID="CalendarExtender1" TargetControlID="txtdate"  runat="server"></cc1:CalendarExtender>
              
               </td>
             
             </tr>

i want to display the date in label which i selected from txtdate ysing ajax