How to check if a String contains any letter from a to z? [duplicate]

What about:

//true if it doesn't contain lettersbool result = hello.Any(x => !char.IsLetter(x));

c# windows string char

Replace your for loop by this :

errorCounter = Regex.Matches(yourstring,@"[a-zA-Z]").Count;

Remember to use Regex class, you have to using System.Text.RegularExpressions; in your import

c# windows string char

You could use RegEx:

Regex.IsMatch(hello, @"^[a-zA-Z]+$");

If you don't like that, you can use LINQ:

hello.All(Char.IsLetter);

Or, you can loop through the characters, and use isAlpha:

Char.IsLetter(character);

CodeHunter