.NET读取文本文件内容分隔后插入MySQL数据库

string path = @"E:\newtest.txt";
            List<String[]> list = new List<string[]>();
            StreamReader reader = new StreamReader(path, System.Text.Encoding.GetEncoding("GB2312"));//path为文本路径
            string[] va = null;
            string value;
            while ((value = reader.ReadLine()) != null)
            {

                value = value.Trim();
                if (value != null)
                {
                    va = value.Split("|".ToCharArray());
                }
             
                list.Add(va);
            }
            reader.Dispose();
            reader.Close();

            string connectstr = "data source=127.0.0.1;Database=rpt;user id=root; password=123";
            MySqlConnection conn = new MySqlConnection(connectstr);
            MySqlCommand myCommand = new MySqlCommand();
            myCommand.Connection = conn;

            conn.Open();
            int j =1;
            foreach (string[] lt in list)
            {
                StringBuilder sb = new StringBuilder();//s实例化StringBuilder 
                sb.Append("insert into rpt_userlist values(");