查询语句datagrid

 objSqlConnection1=new SqlConnection("Server=EP-MF5;Database=tongzongwu;uid=sa;pwd=123");
            objSqlConnection1.Open();
      sqlDataAdapter1=new SqlDataAdapter("select * from StudentsInfo", objSqlConnection1);
            sqlDataAdapter1.Fill(bojDataSet,"StudentsInfo");
   dataGrid1.DataSource=bojDataSet.Tables[0].DefaultView;