Programmatically setting the width of a grid column with * in WPF

Question

I want to programmatically configure a wpf grid.

I want to be able to set a grid with 2 columns, the first taking up 20% of available space, the second taking up 80

Answer 1

Grid grid = new Grid();
ColumnDefinition c1 = new ColumnDefinition();
c1.Width = new GridLength(20, GridUnitType.Star);
ColumnDefinition c2 = new ColumnDefinition();
c2.Width = new GridLength(80, GridUnitType.Star);
grid.ColumnDefinitions.Add(c1);
grid.ColumnDefinitions.Add(c2);