c# 连接sqlServer2000

class ConnectDB
    {
        private SqlConnection myConn;
        /// <summary>
        /// 服务器连接字任串
        /// </summary>
        private string ServerStr;
        /// <summary>
        /// 服务器地址
        /// </summary>
        static string server;
        /// <summary>
        /// 数据库登陆用户名
        /// </summary>
        static string uid;
        /// <summary>
        /// 登陆密码
        /// </summary>
        static string pwd;
        /// <summary>
        /// 数据库名
        /// </summary>
        static string database;
        /// <summary>
        /// 构造函数
        /// </summary>
        public ConnectDB()
        {
            ServerStr = "server=" + server + ";uid=" + uid + ";password=" + pwd + ";database=" + database;
            myConn = new SqlConnection(ServerStr);
        }
        /// <summary>
        /// 打开连接
        /// </summary>
        public void Open()
        {
            myConn.Open();
        }
        /// <summary>
        /// 测试数据库
        /// </summary>
        public int tOpen()
        {
            try
            {
                myConn.Open();
                return 1;
            }
            catch
            {
                return 0;
            }
        }
        /// <summary>
        /// 关闭连接
        /// </summary>
        public void Close()
        {
            myConn.Close();
        }
        /// <summary>
        /// 把自义类转化为SqlConnection类
        /// </summary>
        /// <returns>SqlConnection</returns>
        public SqlConnection ChangeType() 
        {
             return myConn;
        }
        /// <summary>
        /// 设置服务器地址
        /// </summary>
        /// <param name="Server">服务器地址</param>
        public static void setServer(string Server)
        {
            server=Server;
        }
        /// <summary>
        ///设置登陆用户名
        /// </summary>
        /// <param name="Uid">用户名</param>
        public static void setUid(string Uid)
        {
             uid=Uid;
        }
        /// <summary>
        /// 设置登陆密码
        /// </summary>
        /// <param name="Pwd">密码</param>
        public static void setPwd(string Pwd)
        {
            pwd=Pwd;
        }
        /// <summary>
        /// 设置数据库
        /// </summary>
        /// <param name="Database">数据库名</param>
        public static void setDatabase(string Database)
        {
            database=Database;
        }
   }