string Connstr = ConfigurationManager.ConnectionStrings["Student"].ToString();

__________conn =new SqlConnection(Connstr); conn.Open();

string sqlstr="select * from teacher";

 ______(1) ______ cmd=new  ______(2)______ ;

 string sqlstr="select * from student";

MySqlCommand cmd = new MySqlCommand(sqlstr, conn); //MySql 实例化 Command 对象_ ___(1)_____    dr = cmd._ ___(2) ____  ; //实例化 MySql 数据库的 DataReader 对象

GridView1. _____(3)_  = dr;

GridView1. _____(4)______  (); //GridView 控件进行数据绑定

string Connstr = ConfigurationManager.ConnectionStrings["Student"].ToString();

___________conn =new SqlConnection(Connstr); conn.Open();

string sqlstr="select * from teacher";

 _____(1) _____ cmd=new  ______ (2)_____ ;

string sqlstr="select * from teacher";

SqlCommand cmd= _________  SqlCommand(sqlstr,Conn);

MySqlCommand cmd = new MySqlCommand(sqlstr, conn); //MySql 实例化 Command 对象

 _______(1) ________ dr = cmd.______ (2)____ //实例化 MySql 数据库的 DataReader 对象