Hide and freeze columns about xamarin.forms.datagrid HOT 3 OPEN

    private Layouts _layout { get; set; } = Layouts.L1;
    private void SwapButton_Clicked(object sender, EventArgs e)
    {
        if (_layout == Layouts.L1)
        {
            this.dataGrid.Columns = GridLayout2();
            _layout = Layouts.L2;
        }
        else
        {
            this.dataGrid.Columns = GridLayout1();
            _layout = Layouts.L1;
        }

        Grid grid = this.dataGrid.Children[0] as Grid; // the header 

        ListView lv = this.dataGrid.Children[1] as ListView;     // the body of the datagrid

        lv.ItemsSource = null;

        lv.ItemsSource = Model.FilteredCatalogItems;

        
    }

    private Xamarin.Forms.DataGrid.ColumnCollection GridLayout1()
    {
        Xamarin.Forms.DataGrid.ColumnCollection cc = new Xamarin.Forms.DataGrid.ColumnCollection();

        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Code", PropertyName = "ProductCode", Width = 100 });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Description", PropertyName = "ProductDescription", Width = new GridLength(2, GridUnitType.Star) });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Unit", PropertyName = "IssueUnit", Width = new GridLength(1, GridUnitType.Star) });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Price", PropertyName = "Price", Width = new GridLength(1, GridUnitType.Star) });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Quantity", PropertyName = "OrderedQty", Width = new GridLength(1, GridUnitType.Star) });

        return cc;
    }

    private Xamarin.Forms.DataGrid.ColumnCollection GridLayout2()
    {
        Xamarin.Forms.DataGrid.ColumnCollection cc = new Xamarin.Forms.DataGrid.ColumnCollection();
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Code", PropertyName = "ProductCode", Width = 100 });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Description", PropertyName = "ProductDescription", Width = new GridLength(2, GridUnitType.Star) });
        cc.Add(new Xamarin.Forms.DataGrid.DataGridColumn() { Title = "Quantity", PropertyName = "OrderedQty", Width = new GridLength(1, GridUnitType.Star) });

        return cc;
    }`