Change local administrator password in C#

Question

I am looking for a way to change the password of a local user account (local Administrator) on a Windows (XP in this case) machine. I have read the CodeProject article about one way to do this, but this just doesn't seem 'clean'.

I can see that this is possible to do with WMI, so that might be the answer, but I can't figure out how to use the WinNT WMI namespace with ManagementObject. When I try the following code it throws an "Invalid Parameter" exception.

public static void ResetPassword(string computerName, string username, string newPassword){ 
            ManagementObject managementObject = new ManagementObject("WinNT://" + computerName + "/" + username); // Throws Exception
            object[] newpasswordObj = {newPassword};
            managementObject.InvokeMethod("SetPassword", newpasswordObj);
}

Is there a better way to do this? (I'm using .NET 3.5)

Edit: Thanks Ely for pointing me in the right direction. Here is the code I ended up using:

public static void ResetPassword(string computerName, string username, string newPassword) { 
        DirectoryEntry directoryEntry = new DirectoryEntry(string.Format("WinNT://{0}/{1}", computerName, username)); 
        directoryEntry.Invoke("SetPassword", newPassword);
}

Answer 1

Try the DirectoryEntry class instead of ManagementObject.

Answer 2

As Ely noted, you can use the System.DirectoryServices code to accomplish this per MSDN:

String myADSPath = "LDAP://onecity/CN=Users,
     DC=onecity,DC=corp,DC=fabrikam,DC=com";

// Create an Instance of DirectoryEntry.
DirectoryEntry myDirectoryEntry = new DirectoryEntry(myADSPath);
myDirectoryEntry.Username = UserName;
myDirectoryEntry.Password = SecurelyStoredPassword;