keypress in C#

[jmcilhinney]

First up, in your original post you said:

my question is, how can i prevent user to input integer values.

That says that you don't want the user to enter any numbers. I'm guessing now that that's just the language barrier and what you actually want is for the user to enter nothing but numbers. Is that correct? If so then the code would be:

char keyChar = e.KeyChar;
 
e.Handled == !char.IsControl(keyChar) && !char.IsDigit(keyChar);

in the KeyPress event handler.