SQLDMO.Application sqlApp = new SQLDMO.ApplicationClass();
            SQLDMO.NameList sqlServers = null;
            sqlServers = sqlApp.ListAvailableSQLServers();
            for (int i = 0; i < sqlServers.Count; i++)
            {
                object srv = sqlServers.Item(i + 1);
                if (srv != null)
                {
                    this.comboBox1.Items.Add(srv);
                }
            }