how to list out users from pc either he created in winnt folder(local users and groups) or active directory( under domain) using c#.net

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C#

hello every body

i have implemented a c# windows application.

for that application i want to provide login from windows user credentails.

now the issue is i need to get the users list from windows pc through code.

how to get users list eaither user created in winnt folder (under local users and groups) or user created in active directory domain.


i have an idea for get users list from winnt folder
that is

DirectoryEntry localMachine = new DirectoryEntry("WinNT://" + Environment.MachineName);
// DirectoryEntry admGroup = localMachine.Children.Find("Guests", "group");
// DirectoryEntry admGroup = localMachine.Children.Find("administrators", "group");
DirectoryEntry admGroup = localMachine.Children.Find("users", "group");
//DirectoryEntry admGroup = localMachine.Children.Find("TestUser1", "group");
object members = admGroup.Invoke("members", null);
foreach (object groupMember in (IEnumerable)members)
{
    DirectoryEntry member = new DirectoryEntry(groupMember);
    listBox1.Items.Add(member.Name);
}

But now i want to list out users, if he is exist in active directory or winnt folder

any body give me code for this to cross verify users from both throug c# code

[edit]Code block added, "Treat my content as plain text..." option disabled - OriginalGriff[/edit]