Arabic Hijri Calender in ASP.Net Ajax CalenderExtender Control

AJAX Calendar extender does not 100% support Hijri Arabic Calendar, still you can add Culture ar-SA in your @Page Directive on page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS"
    EnableEventValidation="false" Culture = "ar-SA" UICulture = "ar-SA" %>

And you will get the calendar as shown below