Can you give me examples of an LDAP connection string for Active Directory?
LDAP://[ServerName]/dc=contoso,dc=com

LDAP://[ServerName]/dc=test,/dc=contoso,dc=com

DirectoryEntry de = new DirectoryEntry("LDAP://[ServerName]/dc=test,/dc=contoso,dc=com");
    de.Username = "username";
    de.Password = "password";