using System;
public class Program
{
   static void Main(string[] args)
   {
      Derived d = new Derived();
      int i = 10;
      d.Func(i);
  }
}

public class Derived
{
  public void Func(int x)
  {
      Console.WriteLine("Derived.Func(int)");
  }
  public void Func(object o)
  {
      Console.WriteLine("Derived.Func(object)");
  }
}