you can use
WebBrowser.Navigating Event[
^] and set the URL to TextBox
public Form1()
{
InitializeComponent();
webBrowser1.Navigating +=
new WebBrowserNavigatingEventHandler(webBrowser1_Navigating);
}
private void webBrowser1_Navigating(object sender,
WebBrowserNavigatingEventArgs e)
{
TextBox1.Text =e.Url.ToString();
}