Ajax:Add Calendar Extendar to TextBox in ASP.NET Using C#

HTML Markup:

First  add Ajax control ToolkitScriptManager on page. 
  1. <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"> </asp:ToolkitScriptManager>  
  2. <asp:TextBox ID="txtfromdate" class="m-wrap span12" autocomplete="off" placeholder="" runat="server"></asp:TextBox>  
  3. <asp:CalendarExtender ID="CalendarExtender1" ClearTime="true" runat="server" TargetControlID="txtfromdate" Format="dd-MM-yyyy"> </asp:CalendarExtender>