C# Online Compiler | .NET Fiddle

using System;

public static class Either
{
	public static Either<A> Return<A>(A val)
	{
		return new Either<A> { Right = val };
	}
	
	public static Either<A> Fail<A>(Exception e)
	{
		return new Either<A> { Left = e };
	}
}

public class Either<A> 
{
	public Exception Left;
	public A Right;
		
	public Either<B> Bind<B>(Func<A,Either<B>> f)
	{
	  if (Left != null) return Either.Fail<B>(Left);
		
	  try { return f(Right); }
	  catch (Exception e) { return Either.Fail<B>(e); }
	}
	
	public override string ToString()
	{
		return string.Format("Either ( Left: {0}, Right: {1} )", ((object)Left) ?? "NULL", ((object)Right) ?? "NULL");
	}
}

public class Program
{
	public static void Main()
	{
		var result = Either.Return(3);
		Console.WriteLine(result);
		
		result = result.Bind(val => Either.Return(5 / val - 1 ));
		Console.WriteLine(result);
		
		result = result.Bind(val => Either.Return(5 / val - 1 ));
		Console.WriteLine(result);
	}
}
Cached Result
Test()
Test<T>()