Set session variable in Application_BeginRequest

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Try AcquireRequestState in Global.asax. Session is available in this event which fires for each request:

void Application_AcquireRequestState(object sender, EventArgs e)
{
    // Session is Available here
    HttpContext context = HttpContext.Current;
    context.Session["foo"] = "foo";
}

Valamas – Suggested Edit:

Used this with MVC 3 successfully and avoids session error.

protected void Application_AcquireRequestState(object sender, EventArgs e)
{
    HttpContext context = HttpContext.Current;
    if (context != null && context.Session != null)
    {
        context.Session["foo"] = "foo";
    }
}

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