Active Directory/LDAP :: Get The List Of Users From Other Domain

I need to get the list of domain usrs. The users not necessorily be on the domain where I am logged in. (e.g. I am logged in on domain "Dom111" but I need the list of users from the domain "Dom222")

I want this information on the basis of following -
1) Name of the Domain
2) A valid User name (of-course with Admin rights for the Target domain) and password

I am trying to use the following code -

DirectoryContext dc = new DirectoryContext(DirectoryContextType.Domain, "Dom222", "Administrator", "password");
Domain domain = Domain.GetDomain(dc);
DirectoryEntry de = domain.GetDirectoryEntry();
FillList(de);

Here is the FillList function
private void FillList(DirectoryEntry de)
{
DirectorySearcher deSearch = new DirectorySearcher(de);
deSearch.Filter = "(&(objectClass=user)(objectCategory=person))";
SearchResultCollection results = deSearch.FindAll();
//checkedListBox1.Items.Clear();
foreach (SearchResult srUser in results)
{
DirectoryEntry deUser = srUser.GetDirectoryEntry();
checkedListBox1.Items.Add(deUser.Properties["sAMAccountName"].Value.ToString());
}
checkedListBox1.Sorted = true;
}

This works fine for the domain where I logged in (i.e. Dom111) but for the other domain (Dom222), while executing the statement - Domain domain = Domain.GetDomain(dc); I am getting the error saying "The specified domain does not exist or cannot be contacted."

Now, For creating the dc if I use following - DirectoryContext dcTemp = new DirectoryContext(DirectoryContextType.DirectoryServer, "Server_dom222", "administrator", "password");
Then everything works fine. But as you can see I need to pass the "Domain Controller (Server) Name"which I want to avoid.