"abc3def".Any(c => char.IsDigit(c));
Update: as @Cipher pointed out, it can actually be made even shorter:
"abc3def".Any(char.IsDigit);
"abc3def".Any(c => char.IsDigit(c));
Update: as @Cipher pointed out, it can actually be made even shorter:
"abc3def".Any(char.IsDigit);