Question

I made a new class, and I’m getting a null reference exception, and I cannot figure out why.

Object reference not set to an instance of an object.

    namespace TIMBaseClasses.ReturnerTracking
{
    [Serializable]
    public class Returner
    {
            private Guid _returnerID;
            private string _clientIP;

            public Guid returnerID {get { return _returnerID; } set { _returnerID = value; }}
            public string clientIP {get { return _clientIP; } set { _clientIP = value; }}


            /// <summary>Constructor that sets the default values as needed</summary>
            public Returner()
            {
                returnerID = Guid.Empty;
                clientIP = string.Empty;
            }

            public static Returner Instance
            {
                get
                {
                    var ret = (Returner)(HttpContext.Current.Session["Returner"] ?? new Returner());
                    HttpContext.Current.Session["Returner"] = ret;
                    return ret;
                }
            }


    }
}

The error happens towards the bottom, on the “var ret” line at the end when I call “new Returner()”.

The line that calls it that causes the error is as follows.

 Returner.Instance.returnerID = id;

EDIT

To address the concerns that the HTTPContext.Current is null, I did a watch and it is not null. However, a watch on “new Returner()” gives me this:

Instance = 'TIMBaseClasses.ReturnerTracking.Returner.Instance' threw an exception of type 'System.NullReferenceException'

Answer 1

Its probably more likely that HTTPContext.Current or HTTPContext.Current.Session is null