public static async Task HandleUserConnections(this EDCLoginUserContext db, HubCallerContext context, string userName, bool isTeacher = false)
        {
            if (db != null && context != null)
            {
                if (isTeacher)
                {
                    var teacher = await db.Teachers.Include(p => p.HubConnections)
                                  .SingleOrDefaultAsync(p => p.TeacherName == userName);

                    if (teacher != null)
                    {
                        teacher.HubConnections.Add(new Models.EDCHubConnection()
                        {
                            HubConnectionID = context.ConnectionId,
                            Connected       = true,
                            LoginDate       = DateTime.Now.Date.ToShortDateString(),
                            LoginTime       = DateTime.Now.ToString("hh:mm tt")
                        });
                        await db.SaveChangesToDbAsync();
                    }
                }
                else
                {
                    var student = await db.Students.Include(p => p.HubConnections)
                                  .SingleOrDefaultAsync(p => p.StudentName == userName);

                    if (student != null)
                    {
                        student.HubConnections.Add(new Models.EDCHubConnection()
                        {
                            HubConnectionID = context.ConnectionId,
                            Connected       = true,
                            LoginDate       = DateTime.Now.Date.ToShortDateString(),
                            LoginTime       = DateTime.Now.ToString("hh:mm tt")
                        });
                        await db.SaveChangesToDbAsync();
                    }
                }
            }
        }
        public static async Task UpdateUserConnection(this EDCLoginUserContext db, string connectionId, bool connected)
        {
            if (db != null)
            {
                var connection = await db.HubConnections.FindAsync(connectionId);

                if (connection != null)
                {
                    connection.Connected = connected;
                    db.SetEntityModified <EDCHubConnection>(connection);
                    await db.SaveChangesToDbAsync();
                }
            }
        }