using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDBFilename=|DataDirectory|\Database1.mdf;Integrated Security=Ture;User Instance=Ture")) ;
            {
                conn.open();
            }
            Console.WriteLine("Open Success!!");
        }
    }
}

server==.\SQLEXPRESS;database=EpgInfo;user id=sa;password=sa;
//database 数据库名
//id 数据库用户名
//password 密码

------解决方案--------------------



  using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDBFilename=|DataDirectory|\Database1.mdf;Integrated Security=Ture;User Instance=Ture")) ;
           {
               conn.open();
               Console.WriteLine("Open Success!!");
           }

局部变量的作用域在大括号内，出了大括号就失去了作用，
像
try
{
   int i=0;
}catch
{

}
i的作用域就在try的大括号内，try外面就无法访问了


------解决方案--------------------
Integrated Security=Ture修改为 Integrated Security=True