No worries Sam,

I did not actually test it but did know that that was the way to do it...

Thanks Lizard.
This one works fine (with slight casting to float change) as follows:
_displayWindow.Font = new Font("Courier New", (float)10.5, FontStyle.Regular);

Thanks for your continued support.
No, as I wrote in my previous reply and example, for most Font properties I get a read-only error.
The only editable properties are face (bold) and Italic.
The font type is read only.
What I did is to change the font in the fixed properties to Curier. It is not what I wanted, (I want to change it programatically) but due to time restriction it is reasonable.
If you have a solution to this, I'd be more than happy to accept and thank for.   

Hello,

Thanks,
It looks simple and easy - but for all Font peoperties I get the message:  
Error 1 Property or indexer 'System.Drawing.Font.Bold' cannot be assigned to -- it is read only
Is there a known 'read only' command that does it?

I built a simple form with a textbox as follows:
 
using System.Windows.Forms;
namespace TextboxTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void buildTextBox()
{
textBox1.Font.Bold = true; textBox1.Font.Name = "Thoma"; textBox1.Font.Size = 12;
}
}
}

Is this you looking for.. or please provide a sample output..

TextBox1.Font.Bold = true;
TextBox1.Font.Name = "Thoma";
TextBox1.Font.Size = 12;