Close the browser window Using C# code

StringBuilder postBackScript = new StringBuilder();
postBackScript.Append("< script language=JavaScript >");
postBackScript.Append("self.close(); ");
postBackScript.Append("</script >");

if (!Page.ClientScript.IsClientScriptBlockRegistered("parentCallBack"))
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "parentCallBack", postBackScript.ToString());