Guid.Empty Field

public: static initonly Guid Empty;

public static readonly Guid Empty;

 staticval mutable Empty : Guid

Public Shared ReadOnly Empty As Guid 

Field Value

Remarks

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.

// Create a GUID and determine whether it consists of all zeros.
Guid guid1 = Guid.NewGuid();
Console.WriteLine(guid1);
Console.WriteLine($"Empty: {guid1 == Guid.Empty}\n");

// Create a GUID with all zeros and compare it to Empty.
var bytes = new Byte[16];
var guid2 = new Guid(bytes);
Console.WriteLine(guid2);
Console.WriteLine($"Empty: {guid2 == Guid.Empty}");

// The example displays output like the following:
// 11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
// Empty: False
//
// 00000000-0000-0000-0000-000000000000
// Empty: True

open System

// Create a GUID and determine whether it consists of all zeros.
let guid1 = Guid.NewGuid()
printfn $"{guid1}"
printfn $"Empty: {guid1 = Guid.Empty}\n"

// Create a GUID with all zeros and compare it to Empty.
let bytes = Array.zeroCreate<byte> 16
let guid2 = Guid bytes
printfn $"{guid2}"
printfn $"Empty: {guid2 = Guid.Empty}"

// The example displays output like the following:
// 11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
// Empty: False
//
// 00000000-0000-0000-0000-000000000000
// Empty: True

Module Example
 Public Sub Main()
 ' Create a GUID and determine whether it consists of all zeros.
 Dim guid1 As Guid = Guid.NewGuid
 Console.WriteLine(guid1)
 Console.WriteLine("Empty: {0}", guid1 = Guid.Empty)
 Console.WriteLine()
 
 ' Create a GUID with all zeros and compare it to Empty.
 Dim bytes(15) As Byte
 Dim guid2 As New Guid(bytes)
 Console.WriteLine(guid2)
 Console.WriteLine("Empty: {0}", guid2 = Guid.Empty)
 End Sub
End Module
' The example displays output like the following:
' 11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
' Empty: False
' 
' 00000000-0000-0000-0000-000000000000
' Empty: True