private void GetBands()
 {
     try
     {
         FacebookContext context = new FacebookContext();
         context.Load <Band>(context.GetBandsQuery(AccessToken),
                             (loadOp) =>
         {
             if (!loadOp.HasError)
             {
                 Bands.Clear();
                 foreach (Band band in loadOp.Entities)
                 {
                     Bands.Add(band);
                 }
             }
             else
             {
                 MessageBox.Show(loadOp.Error.ToString());
             }
         },
                             null);
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }