using System;

​

public class Program

{

    // Code from: https://docs.microsoft.com/en-us/dotnet/api/system.guid.parseexact?view=netframework-4.8

    // But I modified it

    public static void Main()

    {

        // Define an array of all format specifiers.

        string[] formats = {"N", "D", "B", "P", "X"};

        Guid guid = Guid.NewGuid();

​

        // Create an array of valid Guid string representations.

        var stringGuids = new string[formats.Length];

        for (int ctr = 0; ctr < formats.Length; ctr++)

            stringGuids[ctr] = guid.ToString(formats[ctr]);

        // Parse the strings in the array using the "B" format specifier.

        const string exactFormatTest = "B";

        foreach (var stringGuid in stringGuids)

        {

            try

            {

                Guid newGuid = Guid.ParseExact(stringGuid, exactFormatTest);

                Console.WriteLine("Successfully parsed exact ({1}) {0}", stringGuid, exactFormatTest);

            }

            catch (ArgumentNullException)

            {

                Console.WriteLine("The string to be parsed is null.");

            }

            catch (FormatException)

            {

                Console.WriteLine("Bad Format when parse exact({1}): {0}", stringGuid, exactFormatTest);

            }

            try

            {

                Guid newGuid = Guid.Parse(stringGuid);

                Console.WriteLine("Successfully parsed {0}", stringGuid);

            }

            catch (ArgumentNullException)

            {

                Console.WriteLine("The string to be parsed is null.");

            }

            catch (FormatException)

            {

                Console.WriteLine("Bad Format when parse: {0}", stringGuid);

            }

            Console.WriteLine();

        }

    // The example displays output similar to the following:

    //

    //    Bad Format: eb5c8c7d187a44e68afb81e854c39457

    //    Bad Format: eb5c8c7d-187a-44e6-8afb-81e854c39457

    //    Successfully parsed {eb5c8c7d-187a-44e6-8afb-81e854c39457}

    //    Bad Format: (eb5c8c7d-187a-44e6-8afb-81e854c39457)

    //    Bad Format: {0xeb5c8c7d,0x187a,0x44e6,{0x8a,0xfb,0x81,0xe8,0x54,0xc3,0x94,0x57}}

    }

}