GetInput

/*
  Console.WriteLine("Please select your initial bet [10,20,50]!");
  bet = int.Parse(GetInput("10", "20", "50"));
*/

private static string GetInput(params string[] values)
{
    var match = GetInput(line => values.Count(v => v.ToLower() == line.ToLower()) == 1);
    return values.First(vv => vv.ToLower() == match.ToLower());
}

private static string GetInput(Func<string, bool> inRange)
{
    return GetInput(_ => _, inRange);
}

/*
  Console.WriteLine("Please Enter Your Age [5..105]");
  playerCount = GetInput(s => int.Parse(s), i => i > 4 && i < 106);
*/

private static T GetInput<T>(Func<string, T> parseInput, Func<T, bool> inRange)
{
    while (true)
        try
        {
            var line = Console.ReadLine();
            T t;
            t = parseInput(line);
            if (!inRange(t)) continue;
            return t;
        }
        catch { };
}