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RegistryValueOptions Enumeration

Specifies optional behavior when retrieving name/value pairs from a registry key.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:  Microsoft.Win32
Assembly:  mscorlib (in mscorlib.dll)

public enum RegistryValueOptions

Member nameDescription
NoneNo optional behavior is specified.
DoNotExpandEnvironmentNamesA value of type RegistryValueKind.ExpandString is retrieved without expanding its embedded environment variables.

Use the DoNotExpandEnvironmentNames flag with the RegistryKey.GetValue(String, Object, RegistryValueOptions) method overload.

The following code sample creates a test key, adds a value with an embedded environment variable, and retrieves the value in both expanded and unexpanded forms.

using System;
using Microsoft.Win32;
using Microsoft.VisualBasic;

public class Example
    public static void Main()
        // Delete and recreate the test key.
        Registry.CurrentUser.DeleteSubKey("RegistryValueOptionsExample", false);
        RegistryKey rk = 

        // Add a value that contains an environment variable.
        rk.SetValue("ExpandValue", "The path is %PATH%", RegistryValueKind.ExpandString);

        // Retrieve the value, first without expanding the environment 
        // variable and then expanding it.
        Console.WriteLine("Unexpanded: \"{0}\"", 
            rk.GetValue("ExpandValue", "No Value", 
        Console.WriteLine("Expanded: \"{0}\"", rk.GetValue("ExpandValue"));
    } //Main
} //Example

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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