My WinForm app needs to accept string from my client in which the format is
as under :

XX-YYYY[ZZZZ]

How do I make my TextBox preformatted such that the dash "-" and brackets
"[]" are already present in the TextBox and that it will accets only 2
characters before dash and four after that and only four in the brackets? To
elaborate further, the empty TextBox on screen should look like the
following (read S as a space) :
+---------------+
| SS-SSSS[SSSS] |
+---------------+

I will highly appreciate a help on this.