Hex/decimal/binary textbox. How?

[lclarsen]

Hi, I would like to implement a textbox into my application that allows the user to enter hex, decimal or binary values (based on the selection of a radiobutton group. For hex values, for example, I would like the entered data to be byte seperated by spaces like this: "0E 3C 32...". I was thinking that a masked textbox was the way to go, but a masked textbox only allows for a fixed length mask, it seems. AFAIK it is not possible to specify a mask that is repeated for the length of the entered data. Do I have to parse the content of the textbox and reset the contents whenever the user enters a single character, or is there a much simpler solution?

[Bob X]

For a masked textbox you don't have to fill all of the mask spaces, so a mask: ###, can have a legal input of "1". You can also set the mask to lengthen itself when the user wants to enter a number longer than the set mask.