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RegistryKey.OpenRemoteBaseKey Method (RegistryHive, String)

Opens a new RegistryKey that represents the requested key on a remote machine.

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

public static RegistryKey OpenRemoteBaseKey(
	RegistryHive hKey,
	string machineName


Type: Microsoft.Win32.RegistryHive
The HKEY to open, from the RegistryHive enumeration.
Type: System.String
The remote machine.

Return Value

Type: Microsoft.Win32.RegistryKey
The requested registry key.


hKey is invalid.


machineName is not found.


machineName is null.


The user does not have the proper permissions to perform this operation.


The user does not have the necessary registry rights.

The local machine registry is opened if machineName is String.Empty. The requested key must be a root key on the remote machine, and is identified by the appropriate RegistryHive value.

In order for a key to be opened remotely, both the server and client machines must be running the remote registry service, and have remote administration enabled.

The following code example shows how to open a registry key on a remote computer and enumerate the values of the key. The remote computer must be running the remote registry service. Specify the name of the remote computer as a command-line argument when invoking the program.

using System;
using System.IO;
using System.Security.Permissions;
using Microsoft.Win32;

class RemoteKey
    static void Main(string[] args)
        RegistryKey environmentKey;
        string remoteName;

        // Check that an argument was specified when the 
        // program was invoked.
        if(args.Length == 0)
            Console.WriteLine("Error: The name of the remote " +
                "computer must be specified when the program is " +
            remoteName = args[0];

            // Open HKEY_CURRENT_USER\Environment 
            // on a remote computer.
            environmentKey = RegistryKey.OpenRemoteBaseKey(
                RegistryHive.CurrentUser, remoteName).OpenSubKey(
        catch(IOException e)
            Console.WriteLine("{0}: {1}", 
                e.GetType().Name, e.Message);

        // Print the values.
        Console.WriteLine("\nThere are {0} values for {1}.", 
        foreach(string valueName in environmentKey.GetValueNames())
            Console.WriteLine("{0,-20}: {1}", valueName, 

        // Close the registry key.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.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.