防注入-通过使用参数

前台

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.Data.SqlClient;
using System.Data;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string sql = "select * from Mes_Login where using System;
using System.Collecti