protected void Application_Error(Object src, EventArgs e ){
			string emAddr = "developer@yoursite.com"
			string trc,message = "Application Error";
				Exception objError = Server.GetLastError();
				if(objError.InnerException != null)
					objError = objError.InnerException;
				
				HttpContext.Current.Application.Add("lastException",objError);
				Server.ClearError();
				trc = objError.StackTrace.Replace(" at ", "<li>");
				trc = trc.Replace(" in ", "<br>&nbsp;&nbsp;&nbsp;&nbsp;");

				message = "<table>"+
					"<tr><td colspan=2><b>Application Error</b></td></tr>"+
					"<tr><td width=80 valign=top>Source:</td><td>"+ objError.Source + "</td></tr>"+
					"<tr><td valign=top>Error:</td><td>"+ objError.Message +"</td></tr>"+
					"</table><hr align=center width=80%><table>"+
					"<tr><td>Stack Trace:</td></tr>"+
					"<tr><td>"+ trc +"</td></tr></table>";
					
				SendEmail(emAddr, "Application Error", message,true);

			Server.Transfer("YourErrorPage.aspx"); 
		}

		public static void SendEmail(string To, string Subject, string Body, bool HTML) {

			System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();
			mail.To = To;
			mail.From = "whoever@yoursite.com";
			mail.Subject = Subject;
			mail.Body=Body;
			mail.BodyFormat = (HTML?System.Web.Mail.MailFormat.Html:System.Web.Mail.MailFormat.Text);

			System.Web.Mail.SmtpMail.SmtpServer = "yourmailserver";
			System.Web.Mail.SmtpMail.Send(mail);
		}