using System;

public class Program

{

    public static void Main()

    {       

        // Get GUID without dashes

        string guid = Guid.NewGuid().ToString("N");

​

        // Get UTC timestamp in the format YYYYMMDDhhmmss

        string timestamp = DateTime.UtcNow.ToString("yyyyMMddHHmmss");

        Console.WriteLine($"{guid}_{timestamp}".ToLowerInvariant());

    }

}