How can manage calendar object in asp.net with c#

How can manage calendar object in asp.net with c#

1. Calendar add on page.

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class Webadmin_Atendence_calt : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

}