配置动态数据库连接

 /// <summary>
        /// 获取数据库连接字符串
        /// </summary>
        /// <param name="DSN">数据库服务器IP</param>
        /// <param name="DBName">数据库名称</param>
        /// <param name="UID">数据库登录名</param>
        /// <param name="PWD">数据库密码</param>
        /// <returns></returns>
        public string GetConStringList(string DSN, string DBName, string UID, string PWD)
        {
            string connectionString = string.Empty;
            connectionString = DbHelperSQL.connectionString = String.Format("Data Source={0};Initial Catalog={1};User ID={2};PWD={3}", DSN, DBName, UID, PWD);
            return connectionString;
        }