public static Group UpdateContactGroup(ContactsRequest cr, Uri contactGroupUrl) { Group group = cr.Retrieve(contactGroupUri); group.Title = "Salsa Friends"; group.Content = "Friends from Salsa class"; try { Group updatedGroup = cr.Update(group); Console.WriteLine("Updated: " + updatedGroup.Updated.ToString()); return updatedGroup; } catch (GDataVersionConflictException e) { // Etags mismatch: handle the exception. } return null; }