Hi,
In WinForm if you have font "Microsoft Sans Serif, 8.25pt" the minimum height you can have for the textbox is 20px. If you get the Font size to 1.5, the you might get the text box height to 10px. This is extremely unreadable.
So, if you set your text box height to 9px then you will get 1px Font Size. if you set the textbox font size to 8.5px then your textbox height will automatically adjust to 20px.
anyhow the code to set the font size is
textBox1.Font = new Font("Microsoft Sans Serif", 8.5f);
I hope this helps you.
Regards
Jegan