// Ready
 public void AcceptTapped(ViewInvitation vInvitation)
 {
     // if clicked to attend - post him
     if (!vInvitation.VerificationStatus)
     {
         PostAttendance(new StudyGroupAttendants {
             StudentId = Settings.StudentId, StudyGroupId = vInvitation.StudyGroup.StudyGroupId
         });
         PutInvitationVerificationSatus(new StudyGroupInvitations {
             StudentId = Settings.StudentId, StudyGroupId = vInvitation.StudyGroup.StudyGroupId, VerificationStatus = true
         });
     }
     else
     {
         PutInvitationVerificationSatus(new StudyGroupInvitations {
             StudentId = Settings.StudentId, StudyGroupId = vInvitation.StudyGroup.StudyGroupId, VerificationStatus = false
         });
         DeleteAttendant(vInvitation.StudyGroup.StudyGroupId);
     }
     vInvitation.VerificationStatus = !vInvitation.VerificationStatus;
 }
 public void ViewTapped(ViewInvitation Inv)
 {
     _pageService.PushAsync(new Views.StudyGroups.ViewStudyGroupDetails(Inv.StudyGroup));
 }