We had a little debate internally on the correct spelling for “can not” in exception message strings.  One of the testers actually dug up a series of bugs where we changed one message back and forth several times.  Well, I am happy to say that we have the official word on this.  The UE manager for the .NET Framework weighted in with a definitive decree.  We have decided to use “cannot”. 

 

If this was a matter of needless debate on your team please feel free to put it to rest now and consider “cannot” the correct spelling.