Thanks community, I hope deliver many new apps to you this year

Try it:

IRISConnection IRISConnect = new IRISConnection();
 IRISConnect.ConnectionString = "Server = " + host 
                + "; Port = " + port + "; Namespace = " + Namespace 
                + "; Password = " + password + "; User ID = " + username;
 IRISConnect.Open();

Thanks, DC Ideas staff, I love implement these ideas