How to set the TAB width in a Windows Forms TextBox control?

Question

Given a WinForms TextBox control with MultiLine = true and AcceptsTab == true, how can I set the width of the tab character displayed?

I wa

Answer 1

The example offered is incorrect.

The EM_SETTABSTOPS message expects the tab sizes to be specified in dialog template units and not in pixels. After some digging around, it appears that a dialog template unit equals to 1/4th the average width of the window's character. So you'll need to specify 8 for 2 characters long tabs, 16 for four charachters, and so on.

So the code can be simplified as:

public static void SetTabWidth(TextBox textbox, int tabWidth)
{
    SendMessage(textbox.Handle, EM_SETTABSTOPS, 1, 
            new int[] { tabWidth * 4 });
}