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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: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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