Article
11/18/2011

Guid.NewGuid Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Initializes a new instance of the Guid class.

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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function NewGuid As Guid

[SecuritySafeCriticalAttribute]
public static Guid NewGuid()

Return Value

Type: System.Guid
A new Guid object.

Remarks

This is a convenient static method that you can call to get a new Guid.

There is a very low probability that the value of the new Guid is all zeroes or equal to any other Guid. You can determine whether a GUID consists of all zeros by comparing it to Guid.Empty.

Examples

The following code example creates and displays the values of two Guid objects.

' This code example demonstrates the Guid.NewGuid() method.

Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim g As Guid
      ' Create and display the value of two GUIDs.
      g = Guid.NewGuid()
      outputBlock.Text &= g.ToString() & vbCrLf
      outputBlock.Text &= Guid.NewGuid().ToString() & vbCrLf
   End Sub 
End Class 
'
'This code example produces the following results:
'
'0f8fad5b-d9cb-469f-a165-70867728950e
'7c9e6679-7425-40de-944b-e07fc1f90ae7
'

// This code example demonstrates the Guid.NewGuid() method.

using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      Guid g;
      // Create and display the value of two GUIDs.
      g = Guid.NewGuid();
      outputBlock.Text += g + "\n";
      outputBlock.Text += Guid.NewGuid() + "\n";
   }
}

/*
This code example produces the following results:

0f8fad5b-d9cb-469f-a165-70867728950e
7c9e6679-7425-40de-944b-e07fc1f90ae7

*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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