odbc code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Odbc;
using System.Configuration;
using System.Data;
public partial class website1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        OdbcConnection con = new OdbcConnection(
           ConfigurationManager.ConnectionStrings["Connname"].ConnectionString);

        con.Open();

        String sname, rollno;
        sname = TextBox1.Text;
        rollno = TextBox2.Text;

        String query1 = "insert into students values('"+sname+"','"+rollno+"')";

        OdbcCommand command1 = new OdbcCommand(query1, con);

        String query = "select * from students";

        OdbcCommand command = new OdbcCommand(query, con);
        OdbcDataReader reader = command.ExecuteReader();
        if (reader.HasRows)
        {

            DataTable dt = new DataTable();
            dt.Load(reader);

            foreach (DataRow row in dt.Rows)
            {
                String name = row[0].ToString();
                String no = row[1].ToString();
                Response.Write("<h1>" + name +" "+no+ "</h1>");
            }

        }
    }
}