using System;
using System.Collections.Generic;

public class Program
{
	public class MyData : IEquatable<MyData>, IComparable<MyData>
	{
		public static implicit operator MyData(string s)    { var data = new MyData(); /* TODO */ return data; }
		public static implicit operator MyData(DateTime dt) { var data = new MyData(); /* TODO */ return data; }
		public static implicit operator MyData(int dt)      { var data = new MyData(); /* TODO */ return data; }

		// implement IComparable<MyData> members...
		// implement IEquatable<MyData> members...

		// override object.Equals()
		// override object.GetHashCode()
		public static bool operator <(MyData a, MyData b) { return Comparer<MyData>.Default.Compare(a,b) == -1; }
		public static bool operator >(MyData a, MyData b) { return Comparer<MyData>.Default.Compare(a,b) == +1; }

		// e.g.: 
		// the desired default representation for comparisons, e.g. string?
		// use 'dynamic' on C# 4.0 and beyond
		private object/*dynamic*/ variant_data;

		public int CompareTo(MyData other)
		{
			// TODO implement your own logic
			return GetHashCode().CompareTo(null != other ? other.GetHashCode() : 0);
		}

		// TODO implement your own equality logic:
		public bool Equals(MyData other)
		{
			if (ReferenceEquals(null, other)) return false;
			if (ReferenceEquals(this, other)) return true;
			return Equals(other.variant_data, variant_data);
		}

		public override bool Equals(object obj)
		{
			if (ReferenceEquals(null, obj)) return false;
			if (ReferenceEquals(this, obj)) return true;
			if (obj.GetType() != typeof (MyData)) return false;
			return Equals((MyData) obj);
		}

		public override int GetHashCode() { return (variant_data != null ? variant_data.GetHashCode() : 0); }
		public static bool operator ==(MyData left, MyData right) { return Equals(left, right); }
		public static bool operator !=(MyData left, MyData right) { return !Equals(left, right); }
	}

	public static void Main(string[] args)
	{
		var cmp = Comparer<MyData>.Default;

		string s = "123";
		int i = 234;
		DateTime dt = DateTime.Now;

		if (-1  == cmp.Compare(s, i))  Console.WriteLine("s < i"); 
		if (+1 == cmp.Compare(dt, i)) Console.WriteLine("dt > i");

		// or even:
		if ((MyData) s > i) Console.WriteLine("s > i");
		if ((MyData) dt< i) Console.WriteLine("dt < i");
	}
}