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Guid.Empty Field

A read-only instance of the Guid structure whose value is all zeros.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static readonly Guid Empty

You can compare a GUID with the value of the Guid.Empty field to determine whether a GUID is non-zero. The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.

using System;

public class Example
{
   public static void Main()
   {
      // Create a GUID and determine whether it consists of all zeros.
      Guid guid1 = Guid.NewGuid();
      Console.WriteLine(guid1);
      Console.WriteLine("Empty: {0}\n", guid1 == Guid.Empty);

      // Create a GUID with all zeros and compare it to Empty.
      Byte[] bytes = new Byte[16];
      Guid guid2 = new Guid(bytes);
      Console.WriteLine(guid2);
      Console.WriteLine("Empty: {0}", guid2 == Guid.Empty);
   }
}
// The example displays output like the following: 
//       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c 
//       Empty: False 
//        
//       00000000-0000-0000-0000-000000000000 
//       Empty: True

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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