how to open http:// url in web browser control in wp7 from one page to another page?

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C#

how to display querystring in web browser control.i have tried following code but it always give output to refresh page.
i have used textbox,two redio button which has values www.yahoo.com and www.google.com respectively.

main page.xaml

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone;

namespace webbrowser2
{   
    public partial class MainPage : PhoneApplicationPage
    {
        public string text;
                 
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            text = textBox1.Text;
        }
        
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            string radiovalue = "";

            browser br = new browser();
            
             if (Convert.ToBoolean(radioButton1.IsChecked == true))
             {
                 var radio = radioButton1.IsChecked;
                 
                br. webBrowser1.Navigate(new Uri("http://www.yahoo.com"));
               
                this.NavigationService.Navigate(new Uri("/browser.xaml?radio=" + radioButton1, UriKind.Relative));

             }
             else if (Convert.ToBoolean(radioButton2.IsChecked == true))
             {              
                 br.webBrowser1.Navigate(new Uri("http://www.google.com"));
                 this.NavigationService.Navigate(new Uri("/browser.xaml?radio=" + radioButton2, UriKind.Relative));
             }
        }
    }
}

and browser.xaml

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
namespace webbrowser2
{
    public partial class browser : PhoneApplicationPage
    {
        public browser()
        {
            InitializeComponent();
            webBrowser1.Loaded += PhoneApplicationPage_Loaded;       
        }
        public string _textBox
        {
            set { textBlock1.Text = value; }
        } 

        private System.Windows.Application webbrowser;
        public MainPage frm;
        public string url;
        
        private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
        {
            MainPage mp = new MainPage();
            webBrowser1.Navigate(new Uri("mp.textbox1.text",UriKind.Relative));

            if (Convert.ToBoolean(mp.radioButton1.IsChecked == true))
            {
                webBrowser1.Navigate(new Uri("http://www.yahoo.com"));
                webBrowser1.Navigate(new Uri("mp.radio", UriKind.Relative));
            }
            else if (Convert.ToBoolean(mp.radioButton2.IsChecked == true))
            {
                webBrowser1.Navigate(new Uri("http://www.google.com"));
            }
        }
    }
}