using System;

using System.Text;

using System.Security.Cryptography;

using System.Web;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var str = "Yevdp0wj3UyyFe2/CGhsEg6KaafS3PlHoLMmtK2vFsrcqF0muPMNSrSlPlUjP5mC";

        var bytes = System.Convert.FromBase64String(str);

        Console.WriteLine(bytes.Length);

        var first = bytes.Take(16).ToArray();

        var second = bytes.Skip(16).Take(16).ToArray();

        var dcId = new Guid(first);

        var docId = new Guid(second);

        Console.WriteLine(dcId);

        Console.WriteLine(docId);

    }

}