应用DataAdapter对象填充DataSet数据集

 private void Form1_Load(object sender, EventArgs e)

        {

            string strCon = "Server=localhost;User Id=sa;Pwd=;DataBase=my";//定义数据库连接字符串

            SqlConnection sqlcon = new SqlConnection(strCon);//实例化数据库连接对象

            SqlDataAdapter sqlda_1 = new SqlDataAdapter("select * from S",sqlcon);//实例化数据库桥接器对象

            SqlDataAdapter sqlda_2 = new SqlDataAdapter("select * from Y",sqlcon);//实例化数据库桥接器对象

            DataSet myds = new DataSet();//实例化数据集对象

            sqlda_1.Fill(myds,"table_name_1");//填充数据集中的指定表

            sqlda_2.Fill(myds, "table_name_2");//填充数据集中的指定表

            //dataGridView1.DataSource = myds.Tables["table_name_1"];//为dataGridView1指定数据源

            //dataGridView1.DataSource = myds.Tables[0];//为dataGridView1指定数据源table_name_1<=>0

            //dataGridView1.DataSource = myds.Tables["table_name_2"];table_name_2<=>1

            dataGridView1.DataSource = myds.Tables[1];

        }