How Do I Use Gecko Webbrowser Control In My Windows Application ?

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C#3.5

I am working on windows application. In that i use activex control and other dll. First i use default webbrowser control of .net. in that i want to display live page of my website .But it's not work in my application because error occur like - " An exception of type 'System.Runtime.InteropServices.SEHException' occurred in System.Windows.Forms.dll but was not handled in user code "
"Additional information: External component has thrown an exception."

This work perfectly in other Test application but not in my Project Application.

so i use alternative of webbrowser control - gecko web browsaer control - in my Form. in that i want to display live page of my website but it will not load. I set the Xulrunner as below..

public Form1()
{
   InitializeComponent();

   Skybound.Gecko.Xpcom.Initialize(@"C:\Program Files\xulrunner");
}

private void Form1_Load(object sender, EventArgs e)
{
   geckoWebBrowser1.Navigate("http://www.google.com");
}

- Error is www.google.com could not be found. please check the name and try again.

it work fine with http://localhost: ... like

geckoWebBrowser1.Navigate("http://localhost:.....");

Please reply me

Thanks in advance..