Guid.ParseExact Method

using System;

public class Example
{
   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. 
      string[] 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.
      foreach (var stringGuid in stringGuids) {
         try {
            Guid newGuid = Guid.ParseExact(stringGuid, "B");
            Console.WriteLine("Successfully parsed {0}", stringGuid);
         }   
         catch (ArgumentNullException) { 
            Console.WriteLine("The string to be parsed is null.");
         }   
         catch (FormatException) {
            Console.WriteLine("Bad Format: {0}", stringGuid);
         }   
      }     
   }
}
// The example displays the following output: 
//    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}}