how to get group DN (for LDAP in AD) C#.NET

[VasquezPL]

Hi guys I have small problem...
I will be provided with group names...(each time = different group)
I need to add user there...

I use code to add users:

public void AddToGroup(string userDn, string groupDn)
        {
            try
            {
                DirectoryEntry dirEntry = new DirectoryEntry("LDAP://" + groupDn);
                dirEntry.Properties["member"].Add(userDn);
                dirEntry.CommitChanges();
                dirEntry.Close();
            }
            catch (System.DirectoryServices.DirectoryServicesCOMException E)
            {
                LogBox.Text = E + "\n";
            }
        }

Unfortunately I dont know how to get groupDN for LDAP://
Is there any way to extract it?