Font linking for a unicode string

[mariocatch]

What you want is the MaskedTextBox.

Some links to get you started:
http://www.microsoft.com/middleeast/...AndArabic.aspx
http://msdn.microsoft.com/en-us/libr...edtextbox.aspx

The arabic link, although written for making a TextBox work in Arabic, has specific instructions on how to use the MaskedTextBox control for a specific language/culture setting.