How to close the window by clicking close button in .net???

<asp:Button ID="CloseButton" runat="server" Text="Close" OnClientClick="javaScript:window.close(); return false;" />


or

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace WebApplication17
{
    public partial class WebForm8 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.Button1.Attributes.Add("OnClick", "self.close()");
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.Write("");
        }
    }
}