MVC Session Manager Custom Class

MVC Create Session Manager Custom Class c#

public class SessionManager
    {
        protected HttpSessionState session;

        public SessionManager(HttpSessionState httpSessionState)
        {
            session = httpSessionState;
        }

        public SessionManager()
        {
            session = HttpContext.Current.Session;
            if (this.User_Name == string.Empty)
                this.IsNull = true;
        }

        public void Dispose()
        {
            session.Clear();
            session.Abandon();
            this.IsNull = true;
        }

        public bool IsNull
        {
            get { return Convert.ToBoolean(session["_IsNull"]); }
            private set { session["_IsNull"] = value; }
        }

        public int System_Id
        {
            get { return Convert.ToInt32(session["_System_Id"]); }
            private set { session["_System_Id"] = value; }
        }

        public int User_Id
        {
            get { return Convert.ToInt32(session["_User_Id"]); }
            private set { session["_User_Id"] = value; }
        }

        public string User_Name
        {
            get { return Convert.ToString(session["_User_Name"]); }
            private set { session["_User_Name"] = value; }
        }

        #region Set Session

        public void SetSession(int id, int systemId, string memberId, string userName, string gender)
        {
            this.User_Id = id;
            this.System_Id = systemId;
            this.User_Name = userName;
            this.IsNull = false;
        }

        #endregion Set Session
    }