pbcopy.cs

using System;
 
namespace Pastebin
{
    class Pbcopy
    {
        [STAThread]
        static void Main(string[] args)
        {
            try
            {
                System.Windows.Forms.Clipboard.SetDataObject(
                    System.Console.In.ReadToEnd(),
                    true
                );
            }
            catch ( System.Exception )
            {
                System.Console.Out.WriteLine("Unable to post to clipboard");
                throw;
            }
        }
    }
 
}

pbpaste.cs

using System;
 
namespace Pastebin
{
    using System;
    using System.Windows.Forms;
    class Pbpaste
    {
        [STAThread]
        static void Main(string[] args)
        {
            try
            {
                Console.Out.Write( Clipboard.GetDataObject().GetData(
                    System.Windows.Forms.DataFormats.StringFormat
                ) );
            }
            catch ( Exception )
            {
                Console.Out.WriteLine( "Unable to post clipboard contents" );
                throw;
            }
        }
    }
}