assign logon script to a local user

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C#

Hello,

I wrote a c# code that creates new local user

DirectoryEntry localMachine = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");
DirectoryEntry group = localMachine.Children.Find("administrators", "group");
DirectoryEntry user = localMachine.Children.Find(accountName, "user");
Console.WriteLine(user.Properties.ToString());

I tried to set the logon script for that user by doing:

localMachine.Properties["scriptPath"].Insert(0, "logonScript.vbs");             
localMachine.CommitChanges();

same with group or user instances.but the property doesn't exist in any of theses instances (localMachine, group or user). I know that because I did:

System.Collections.ICollection col = localMachine.Properties.PropertyNames;                
foreach (Object ob in col) {
        Console.WriteLine(ob.ToString());
} 

Any idea of how to do that in other way?
Cheers,