Uploadify ashx file Context.Session gets null

Question

I have a file upload in my site which is done using uploadify it uses a ashx page to upload file to database.It works fine in IE but in Mozilla the context.Session is gettin

Answer 1

You need to add sessionId to uploadify post params and restore ASP.NET_SessionId cookie on the server side on global.asax at OnBeginRequest. It is actually bug with flash and cookies.

I have created module for session and auth cookie restore, to get work flash and asp.net session, so i think it will be useful for your:

public class SwfUploadSupportModule : IHttpModule
{
    public void Dispose()
    {
        // clean-up code here.
    }

    public void Init(HttpApplication application)
    {
        application.BeginRequest += new EventHandler(OnBeginRequest);
    }

    private void OnBeginRequest(object sender, EventArgs e)
    {
        var httpApplication = (HttpApplication)sender;

        /* we guess at this point session is not already retrieved by application so we recreate cookie with the session id... */
        try
        {
            string session_param_name = "ASPSESSID";
            string session_cookie_name = "ASP.NET_SessionId";
            if (httpApplication.Request.Form[session_param_name] != null)
            {
                UpdateCookie(httpApplication, session_cookie_name, httpApplication.Request.Form[session_param_name]);
            }
            else if (httpApplication.Request.QueryString[session_param_name] != null)
            {
                UpdateCookie(httpApplication, session_cookie_name, httpApplication.Request.QueryString[session_param_name]);
            }
        }
        catch
        {
        }

        try
        {
            string auth_param_name = "AUTHID";
            string auth_cookie_name = FormsAuthentication.FormsCookieName;

            if (httpApplication.Request.Form[auth_param_name] != null)
            {
                UpdateCookie(httpApplication, auth_cookie_name, httpApplication.Request.Form[auth_param_name]);
            }
            else if (httpApplication.Request.QueryString[auth_param_name] != null)
            {
                UpdateCookie(httpApplication, auth_cookie_name, httpApplication.Request.QueryString[auth_param_name]);
            }
        }
        catch
        {
        }            
    }

    private void UpdateCookie(HttpApplication application, string cookie_name, string cookie_value)
    {
        var httpApplication = (HttpApplication)application;

        HttpCookie cookie = httpApplication.Request.Cookies.Get(cookie_name);
        if (null == cookie)
        {
            cookie = new HttpCookie(cookie_name);
        }
        cookie.Value = cookie_value;
        httpApplication.Request.Cookies.Set(cookie);
    }
}

Also than you need register above module at web.config: