public void Remove(MeetViewer viewer)
 {
     if (Context.Entry(viewer).State == EntityState.Detached)
     {
         context.MeetViewers.Attach(viewer);
     }
     context.MeetViewers.Remove(viewer);
 }
 public void Add(MeetViewer viewer)
 {
     context.MeetViewers.Add(viewer);
 }