Ajax Toolkit Calendar

1. Apply Script Manger

<asp:ScriptManager ID="Script" runat="server"></asp:ScriptManager>

2.Using this code inside of Textbox

  <asp:TextBox ID="txtEndDate" runat="server" CssClass="input-sm"></asp:TextBox>

                <ajaxToolkit:CalendarExtender runat="server" ID="CalendarExtender1" TargetControlID="txtEndDate" Format="dd/MM/yyyy" />


    (key Words: target Control Id is Textbox Id )