how to display a next question on click of a button

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ASP.NET

The following is my code, m doing project on online examination in that i have a module of question to display in this when i click on next button it should go to the next question but it is not going.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.Security;
using System.Data;

public partial class Student : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
int i=1;
Session["Number"] = i;
protected void Page_Load(object sender, EventArgs e)
{
Session["Number"] = i++;
Label1.Text = Session["Number"].ToString();

con.Open();
SqlCommand cmd = new SqlCommand("Select * from Questions where QuestionNo = '"+Label1.Text+"'", con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
Label2.Text = dr["Question"].ToString();
Label3.Text = dr["Ans1"].ToString();
Label4.Text = dr["Ans2"].ToString();
Label5.Text = dr["Ans3"].ToString();
Label6.Text = dr["Ans4"].ToString();
}
con.Close();

con.Open();
SqlCommand cmd1 = new SqlCommand("Select * from Answers where QuestionNo = '" + Label1.Text + "'", con);
SqlDataReader dr1 = cmd1.ExecuteReader();
if (dr1.Read())
{
Label8.Text = dr1["Answer"].ToString();
}
con.Close();
}
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
if (RadioButton1.Checked)
{
Label7.Text = Label3.Text;
}
}
protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
{
if (RadioButton2.Checked)
{
Label7.Text = Label4.Text;
}
}
protected void RadioButton3_CheckedChanged(object sender, EventArgs e)
{
if (RadioButton3.Checked)
{
Label7.Text = Label5.Text;
}
}
protected void RadioButton4_CheckedChanged(object sender, EventArgs e)
{
if (RadioButton4.Checked)
{
Label7.Text = Label6.Text;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Label7.Text == Label8.Text)
{
Label9.Text = "Your Answer is correct";
}
else
Label9.Text = "Your Answer is incorrect";
}
protected void Button2_Click(object sender, EventArgs e)
{
i++;
Session["Number"] = i;
Response.Redirect("Student.aspx");

}
}