How to properly set sessions in HttpContext?

Question

I am using:

    if (string.IsNullOrEmpty(myHttpContext.Request.QueryString["code"]))
    {

        if (myHttpContext.Session == null || myHttpContext.Session["code"] == null)
        {
            OutputError("Code", "Invalid code.");
        }
        else
        {
            code = myHttpContext.Session["code"].ToString();
        }
    }
    else
    {
        code = myHttpContext.Request.QueryString["code"];
        myHttpContext.Session.Add("code", code);
    }

However I keep getting the error: Object reference not set to an instance of an object.

For: myHttpContext.Session.Add("code", code);

All I want to do is set a simple session, someone please help this is driving me crazy.

Answer 1

Has your IHttpHandler (ashx) class implemented IRequireSessionState? Otherwise the Session object will not be accessible.

public class MyHandler : IHttpHandler, IRequireSessionState
{
   public bool IsReusable { get { return false; } }

   public void ProcessRequest(HttpContext ctx)
   {
       // your code here
   }
}