private void validateWarehouses()
        {
            bool isValid = true;

            if (this.WarehouseOriginSelect != null)
            {
                if (this.WarehouseDestinySelect != null)
                {
                    if (this.WarehouseOriginSelect.Equals(this.WarehouseDestinySelect))
                    {
                        isValid = false;
                        App.Current.MainPage.DisplayAlert("TSHIRT", "Debe seleccionar almacenes distintos", "OK");
                    }
                }
                else
                {
                    isValid = false;
                    App.Current.MainPage.DisplayAlert("TSHIRT", "Debe seleccionar un alamcén destino", "OK");
                }
            }
            else
            {
                isValid = false;
                App.Current.MainPage.DisplayAlert("TSHIRT", "Debe seleccionar un alamcén origen", "OK");
            }

            if (isValid)
            {
                var productsTransfer = new ProductsTransfer()
                {
                    BindingContext = this
                };
                Xamarin.Forms.Application.Current.MainPage.Navigation.PushAsync(productsTransfer);
            }
        }
 public ProductsTransferCompare()
 {
     Error = 0;
     Load  = new ProductsTransfer();
     Delv  = new ProductsTransfer();
 }