how two Merge to columns in TableLayoutPanel

hi i want to know

how to Merge two columns in TableLayoutPanel in windows app in .net (vb.net or C#.net)

you'd use the control's colSpan property to use 2 columns for 1 control

i want to know how i make that in coding

here's an example with a button that i set DockStyle.Fill + column span 2:

vb Code:

Button1.Dock = DockStyle.Fill
TableLayoutPanel1.SetColumnSpan(Button1, 2)

thank you very much for help me
many thankxxxxxxxxx