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web.config
<customErrors mode="On" defaultRedirect="ApplicationErroy.aspx" >
<error statusCode="403" redirect="403.htm"/>
<error statusCode="404" redirect="404.htm"/>
<error statusCode="500" redirect="500.htm"/>
</customErrors>

Global.asax
<%@ Application Language="C#" %>
<mce:script runat="server"><!--
void Application_Start(object sender, EventArgs e)
{
// ÔÚÓ¦ÓóÌÐòÆô¶¯Ê±ÔËÐеĴúÂë
}

void Application_End(object sender, EventArgs e)
{
// ÔÚÓ¦ÓóÌÐò¹Ø±ÕʱÔËÐеĴúÂë
}

void Application_Error(object sender, EventArgs e)
{
// ÔÚ³öÏÖδ´¦ÀíµÄ´íÎóʱÔËÐеĴúÂë
Exception erroy = Server.GetLastError();
string err = "³ö´íÒ³ÃæÊÇ£º" + Request.Url.ToString() + "</br>";
err += "Òì³£ÐÅÏ¢£º" + erroy.Message + "</br>";
err += "Source:" + erroy.Source + "</br>";
err += "StackTrace:" + erroy.StackTrace + "</br>";
//Çå³ýÇ°Ò»¸öÒì³£
Server.ClearError();
//´Ë´¦ÀíÓÃSession["ProError"]³ö´í¡£ËùÒÔÓà Application["ProError"]
Application["erroy"] = err;
//´Ë´¦²»ÊÇpageÖУ¬²»ÄÜÓÃResponse.Redirect("../frmSysError.aspx");
System.Web.HttpContext.Current.Response.Redirect(HttpContext.Current.Request.ApplicationPath + "/ApplicationErroy.aspx");
}
void Session_Start(object sender, EventArgs e)
{
// ÔÚлỰÆô¶¯Ê±ÔËÐеĴúÂë
}
void Session_End(object sender, EventArgs e)
{
// ÔڻỰ½áÊøʱÔËÐеĴúÂë¡£
// ×¢Òâ: Ö»ÓÐÔÚ Web.config ÎļþÖÐµÄ sessionstate ģʽÉèÖÃΪ
// InProc ʱ£¬²Å»áÒý·¢ Session_End ʼþ¡£Èç¹û»á»°Ä£Ê½É