Accessing The Session Object From Within An HttpHandler (ASHX)

By default if you try to use the line above you’ll get an impressive null

var mySession = System.Web.HttpContext.Current.Session;

To make this work, the only thing you have to do is implement the
System.Web.SessionState.IReadOnlySessionState on your handler.

using System.Web.SessionState;

public abstract class BaseHandler : IHttpHandler, IReadOnlySessionState {
   public void ProcessRequest(HttpContext context)
   {
       var mySession = System.Web.HttpContext.Current.Session;
       // your code here //
   }
}

And that’s it!