Arturito.net

Numeric values:


public bool isNumeric(string str) {
Regex pattern = new Regex("[^0-9]");
return !pattern.IsMatch(str);
}


Alfa values:


private bool IsAlpha(string str) {
Regex pattern = new Regex("[^a-zA-Z]");
return !pattern.IsMatch(str);
}


Alfa numeric values:

private bool isAlfaNumeric(string str) {
Regex pattern = new Regex("[^a-zA-Z0-9]");
return !pattern.IsMatch(str);
}