Question

Is there a windows form textbox or c# string native member method that checks if its contents have any non-alphanumeric character?

or do I have to do it manually?

EDIT:
I used @Habib’s answer and added so that white spaces are checked as well, and to my surprise, it worked! lol

bool result = strVariable.Any(r=> (!char.IsLetterOrDigit(r) && !char.IsWhiteSpace(r)));

Btw, I’ve never used the “lambda” expression that’s why I’m surprised the code above worked when I added the whitespace condition on @Habib’s initial answer.

Answer 1

You can use char.IsLetterOrDigit

Indicates whether a Unicode character is categorized as a letter or a
decimal digit.

bool result = strVariable.Any(r=> !char.IsLetterOrDigit(r));