using System;

using System.Reflection;

​

class Constants

{

    public const string MIN_NAME_LENGTH = "10";

    public const string MAX_NAME_LENGTH = "20";

    public static string GetValue(string index)

    {

        return typeof(Constants).GetField(index, BindingFlags.Public | BindingFlags.Static).GetValue(null) as string;

    }

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Constants.GetValue("MIN_NAME_LENGTH"));

        Console.WriteLine(Constants.GetValue("MAX_NAME_LENGTH"));

    }

}