Grid Layout of Xamarin.Forms sample

GridDefinitionSample.cs

var grid = new Grid();
grid.RowDefinitions.Add(new RowDefinition
{
    Height = new GridLength(2, GridUnitType.Star)
});
grid.RowDefinitions.Add(new RowDefinition 
{
    Height = new GridLength (1, GridUnitType.Star) 
});
grid.RowDefinitions.Add (new RowDefinition 
{
    Height = new GridLength(200)
});
grid.ColumnDefinitions.Add (new ColumnDefinition
{
    Width = new GridLength (200) 
});