HttpContext.Current.Session is null in web service

I was working with an web service (the old school .asmx kind), and I was encountering an issue where my Session object was null. Not a particular Session variable – all Session objects. When I would try to reference the following line, I was getting the “Object reference not found” message when I hovered over the “Session” part of the line in the debugger:

Session["Result"] = result;

To get around this, I added the “EnableSession” to true in the WebMethod attribute:

    [WebMethod(EnableSession = true)]
    public string RegisterNewUser(string bname, string first, string last) {
       // Do stuff
    }