URL Rewriting using ASP.NET for SEO

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class UnfriendlyPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            lblDetails.Text = "<h1>Hello from UnfriendlyPage.aspx!</h1><br/><br/>";

        }
        else
        {
            lblDetails.Text = "<h1>Post-back to UnfriendlyPage.aspx!</h1><br/><br/>";

        }


        foreach (string Query in Request.QueryString.Keys)
        {
            lblDetails.Text += "PARAMETER: " + Query + "=" + Request.QueryString[Query] + "<br/>";
        }

        lblDetails.Text += "<br/><br/>Request URL: " + Request.RawUrl;
    }
}