c# how to check if character is a letter code example

Example 1: c# check if char is string

if (abc.ToLower().IndexOf('s') != -1) { }

Example 2: c# check characters in string

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

Example 3: c# check characters in string

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