using System;
var c1 = 'A';
var isLetter = char.IsLetter(c1);
var isNumber = char.IsNumber(c1);
var isSymbol = char.IsSymbol(c1);
//isLetter is True
//isNumber is False
//isSymbol is False
var symbolList = "@#$%^&*";
var c2 = '$';
var isInList = symbolList.Contains(c2);
//isInList is True
Console.WriteLine("isLetter is " + isLetter);
Console.WriteLine("isNumber is " + isNumber);
Console.WriteLine("isSymbol is " + isSymbol);
Console.WriteLine("isInList: " + isInList);