Check if Keys is Letter/Digit/Special Symbol

Question

I override ProcessCmdKey and when I get Keys argument, I want to check if this Keys is Letter or Digit or Special Symbol.

I ha

Answer 1

I have tried the following code but for some reason char.IsLetter() method is recognising the following keys as Letters???

F1, F8, F9, F11, F12, RightShift, LeftShift, RightAlt, RightCtrl, LeftCtrl, LeftWin, RightWin, NumLock.

This method doesn't seem to be that full proof regarding what it thinks is a letter.

if(char.IsLetter((char)e.Key) || char.IsDigit((char)e.Key))