C#: Trap Consecutive Spaces

Hi,

Hope someone can help me with this. I need to trap or not allow a user from inputting consecutive spaces but I dont know how to do it. Im using C# in Windows Application Form. I have a description textbox and that is where I need not to accept the consecutive spaces. Space should only be accept after a non space character. Hope you get what I mean (e.g. I(space)(space)am(space)good) the two spaces between "I" and "am" should not be allowed, only the first space should be allowed.

Thanks,

MukuroRokudo