private void GetCustomerCollection()
 {
     try
     {
         ShowProgressBar = true;
         Task.Factory.StartNew(() =>
         {
             this.Entity = CustomerAction.GetCustomerList(this.DBConnectionString);
             //this.Entity.MakeObservableListClean();
             //this.Entity.MakeClean();
             ShowProgressBar = false;
         });
     }
     catch (Exception)
     {
         throw;
         throw;
     }
 }