How to go into signup page from login page when i click onto signup

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.Data;

public partial class Default2 : System.Web.UI.Page
{
   

    SqlConnection con = new SqlConnection("Data Source=...........;Initial Catalog=EmployeeDB;Integrated Security=True");


    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnlogin_Click(object sender, EventArgs e)
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from information where Username=@Username and Password=@Password", con);
        cmd.Parameters.AddWithValue("@Username", TextBox1.Text);
        cmd.Parameters.AddWithValue("@Password", TextBox2.Text);
        SqlDataAdapter ad = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        ad.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            Session["Username"] = TextBox1.Text;

            Response.Redirect("Default3.aspx");
        }
        else
        {
            Label3.Visible = true;
            Label3.Text = "Invalid username&password....!!!";

        }
      
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Default5.aspx");
    }
}

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;

public partial class Default5 : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("Data Source=.........;Initial Catalog=EmployeeDB;Integrated Security=True");

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnsave_Click(object sender, EventArgs e)
    {
        con.Open();
        string qry = "insert into information values('" +TextBox1.Text + "','" + TextBox2.Text + "','"+TextBox3.Text+"','"+TextBox4.Text+"','"+TextBox5.Text+"')"; 
        SqlCommand cmd = new SqlCommand(qry,con);
        cmd.ExecuteNonQuery();
        con.Close();
    }
}