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Revision: 13861
at September 4, 2009 17:08 by jink
Updated Code 
private void AddKeepAlive()
{
	int int_MilliSecondsTimeOut = 2 * 60 * 1000; /*2 minutes*/ //Math.Max((this.Session.Timeout * 60000) - 30000, 5000);
	string path = VirtualPathUtility.ToAbsolute("~/KeepAlive.aspx");

	string str_Script = @"<script>(function(){var r=0,w=window;if (w.setInterval)w.setInterval(function() {r++;var img=new Image(1,1);img.src='" + path + @"?count='+r;}," + int_MilliSecondsTimeOut.ToString() + @");})();</script>";
	Page.ClientScript.RegisterStartupScript(typeof(Page), UniqueID + "Reconnect", str_Script);
}

//[KeepAlive.aspx:]
<%@ OutputCache Location="None" VaryByParam="None" %>
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<%=now %>
</html>

Revision: 13860
at May 8, 2009 10:09 by jink
Initial Code 
private void AddKeepAlive()
{
	int int_MilliSecondsTimeOut = 2 * 60 * 1000; /*2 minutes*/ //Math.Max((this.Session.Timeout * 60000) - 30000, 5000);
	string path = VirtualPathUtility.ToAbsolute("~/KeepAlive.aspx");

	string str_Script = @"<script>var refreshCount=0;if (window && window.setInterval)window.setInterval(function() {refreshCount++;var img=new Image(1,1);img.src='" + path + @"?count='+refreshCount;}," + int_MilliSecondsTimeOut.ToString() + @");</script>";
	Page.ClientScript.RegisterStartupScript(typeof(Page), UniqueID + "Reconnect", str_Script);
}

//[KeepAlive.aspx:]
<%@ OutputCache Location="None" VaryByParam="None" %>
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<%=now %>
</html>
Initial URL 
http://www.codeproject.com/KB/session/Reconnect.aspx
Initial Description 
Call AddKeepAlive() in Page_Load of the page that needs it.  Change the path to the correct keep alive page.

Page should disable caching, like in second code snippet.
Initial Title 
ASP.net: Session timeout prevention (keep alive).
Initial Tags 
aspnet
Initial Language 
ASP