// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002460/object-isvalidguid

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        Guid originalGuid = Guid.NewGuid();

        string format = "{0, -70} {1, -15}";

        object [] values = { "-128" , "ABC",  ".", "0", "10.2", 

                            originalGuid.ToString("B"), originalGuid.ToString("D"), 

                            originalGuid.ToString("N"), originalGuid.ToString("P"),

                            originalGuid.ToString("X")

                           };

        Console.WriteLine(format, "Object", "Is Valid Guid");

        Console.WriteLine(format, "------", "-------------");

        foreach(var val in values)

        {

            // C# Extension Method: Object - IsValidGuid

            Console.WriteLine(format, val, val.IsValidGuid());

        }

    }

}