Get session object from sessionID in ASP.Net - asp.net

Question

Is there anyway to get a session object from a sessionID?
I have a small project using a Flash upload to let a user upload their file to the server, but the problem is that Flash has some error when sending the session and cookie (in Firefox or Chrome, but not IE), so I found a solution to fix this problem: sending the sessionID through Flash to the server, and on the server, decode sessionID back to the session object, but I don't how to do it. I'm using ASP.NET and C#.
Can anyone advise me on what to do?

Answer 1

The link proposed by Moo-Juice is no longer working.
I used the code provided in this page:
http://snipplr.com/view/15180/
It worked like a charm.
If the link would become broken, here is the code:
void Application_BeginRequest(object sender, EventArgs e)
{
try
{
string session_param_name = "ASPSESSID";
string session_cookie_name = "ASP.NET_SESSIONID";
string session_value = Request.Form[session_param_name] ?? Request.QueryString[session_param_name];
if (session_value != null) { UpdateCookie(session_cookie_name, session_value); }
}
catch (Exception) { }
try
{
string auth_param_name = "AUTHID";
string auth_cookie_name = FormsAuthentication.FormsCookieName;
string auth_value = Request.Form[auth_param_name] ?? Request.QueryString[auth_param_name];
if (auth_value != null) { UpdateCookie(auth_cookie_name, auth_value); }
}
catch (Exception) { }
}
void UpdateCookie(string cookie_name, string cookie_value)
{
HttpCookie cookie = HttpContext.Current.Request.Cookies.Get(cookie_name);
if (cookie == null)
{
HttpCookie cookie1 = new HttpCookie(cookie_name, cookie_value);
Response.Cookies.Add(cookie1);
}
else
{
cookie.Value = cookie_value;
HttpContext.Current.Request.Cookies.Set(cookie);
}
}