using System;

public class Program

{   

    public void Main()

    {

        Console.WriteLine(GetMax(10, 12));

        Console.WriteLine(GetMax2(10, 12));

    }

    public static IComparable GetMax(IComparable s1, IComparable s2)

    {

        return s1.CompareTo(s2) > 0 ? s1 : s2;

    } 

    public static T GetMax2<T>(T s1, T s2) where T: IComparable

    {

        return s1.CompareTo(s2) > 0 ? s1 : s2;

    }

}

​