1 using System; 2 using System.Collections.Generic; 3 using System.Data; 4 using System.Data.SqlClient; 5 using System.Linq; 6 using System.Text; 7  8 namespace test2 9 {10     class Program11     {12         static void Main(string[] args)13         {14             SqlConnection conn = new SqlConnection();15             conn.ConnectionString = "Data Source=HZ-PC;Initial Catalog=mydb;Persist Security Info=True;User ID=sa;Password=123";//设置连接属性16             conn.Open();//连接数据库17             SqlCommand cmd = conn.CreateCommand();//从所建立的数据库连接中新建数据库命令变量18             cmd.CommandText = "select * from db_line";   //赋值19             SqlDataReader dr = cmd.ExecuteReader();//建立数据拾取器，接收数据20             Console.WriteLine("ID     姓名    编号    票");21             while(dr.Read())//循环依次打印数据22                 Console.WriteLine("{0}    {1}    {2}    {3} ",dr[0],dr[1],dr[2],dr[3]);23             dr.Close();24             conn.Close();25         }26     }27 }