async Task <bool> ExecuteLoadCandidateList(ContactCandidateRequest model)
        {
            if (IsBusy)
            {
                return(true);
            }
            IsBusy = true;
            try
            {
                CandiateList.Clear();
                var CandidateResultFromStore = await DataStore.GetCandidateAsync(model);

                if (CandidateResultFromStore == null)
                {
                    CandidateResultFromStore = new List <ContactDTO>();
                }
                foreach (var item in CandidateResultFromStore)
                {
                    CandiateList.Add(item);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
            }
            finally
            {
                IsBusy = false;
            }
            return(true);
        }
 async Task <bool> ExecuteClearCandidateList()
 {
     if (IsBusy)
     {
         return(true);
     }
     IsBusy = true;
     try
     {
         await Task.Factory.StartNew(() => {
             CandiateList.Clear();
         });
     }
     catch (Exception ex)
     {
         Debug.WriteLine(ex);
     }
     finally
     {
         IsBusy = false;
     }
     return(true);
 }