gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
					
public class Program
{
	public static void Main()
	{
		var id = ConvertGuidToBinData3("xxxxxxxxxxxxxx");
		Console.WriteLine("{ \"Customer._id\": BinData(3, '" + id + "') }");
	}
	
	public static Guid ConvertBinData3ToGuid(string input)
{
    var bytes = Convert.FromBase64String(input);
    return new Guid(bytes);
}
	
	public static string ConvertGuidToBinData3(string input) {
		Guid parsed = Guid.Parse(input);
		return Convert.ToBase64String(parsed.ToByteArray());
	}
}