Enable only Sunday in jQuery DatePicker in ASP.Net

 protected void calendarDayRender(object sender, DayRenderEventArgs eargs)
       {

         if (eargs.Day.Date.DayOfWeek == DayOfWeek.Sunday)
            {
                eargs.Day.IsSelectable = true;
                eargs.Cell.BackColor = System.Drawing.Color.Green;
            }
            else
           {
                eargs.Day.IsSelectable = false;
           }
        }


<asp:Calendar ID="Calendar1" runat="server" ondayrender="calendarDayRender"  ></asp:Calendar>

if you check the above code.

We can have this with asp:Calendar control, but i must use calendar extender so is there any way to do like this.