C#

RegistryAccess reg = new RegistryAccess();
PrincipalContext adPrincipalContext;

if (reg.LDAPauth) adPrincipalContext = new PrincipalContext(ContextType.Domain, reg.LDAPpath, reg.LDAPusername, reg.LDAPpassword);
else adPrincipalContext = new PrincipalContext(ContextType.Domain, reg.LDAPpath);

UserPrincipal user = UserPrincipal.FindByIdentity(adPrincipalContext, this.UserName);
PrincipalSearchResult<Principal> results = user.GetAuthorizationGroups();

foreach (Principal result in results)
{
    AddListBoxCurrent(result.Name);
}

try
{
    using (DirectoryEntry root = new DirectoryEntry())
    {
        RegistryAccess reg = new RegistryAccess();
        root.Path = "LDAP://" + reg.LDAPpath;
        if (reg.LDAPauth)
        {
            root.Username = reg.LDAPusername;
            root.Password = reg.LDAPpassword;
        }

        using (DirectorySearcher searcher = new DirectorySearcher())
        {
            searcher.SearchRoot = root;
            searcher.SearchScope = SearchScope.Subtree;
            searcher.Filter = "(ObjectCategory=group)";
            searcher.PropertiesToLoad.Add("name");
            searcher.PropertiesToLoad.Add("grouptype");
            SearchResultCollection results = searcher.FindAll();

            if (results != null)
            {
                int count = results.Count;

                foreach (SearchResult result in results)
                {
                    ResultPropertyCollection props = result.Properties;
                    foreach (string propName in result.Properties.PropertyNames)
                    {
                        if (propName == "name") AddListBoxAvail(props[propName][0].ToString());
                    }
                }
            }

            searcher.Dispose();
            root.Close();
        }
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}

SerialPort port=new SerialPort(.....);
port.NewLine= "\r";
StreamReader sr=new StreamReader(port.BaseStream);

while (!sr.endOfFile)
{
    line=  sr.readLine();
}