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

Question

Possible Duplicate:
C# Regex: Checking for “a-z” and “A-Z”

I could just use the code below:

String hello = "Hello1"; Char[] convertedString = String.ToCharArray(); int errorCounter = 0; for (int i = 0; i < CreateAccountPage_PasswordBox_Password.Password.Length; i++) {     if (convertedString[i].Equals('a') || convertedString[i].Equals('A') .....                             || convertedString[i].Equals('z') || convertedString[i].Equals('Z')) {         errorCounter++;     } } if(errorCounter > 0) {     //do something } 

but I suppose it takes too much line for just a simple purpose, I believe there is a way which is much more simple, the way which I have not yet mastered.

Answer 1

What about:

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