System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

Question

I run a simple C# WPF application that uses a browser embedded in it. I have created a event when the browser navigates to the given url. But this bug comes during runtime:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

Additional information: Exception has been thrown by the target of an invocation. The code is as follows,

public MainWindow()
{
    // Some initialisation
    webBrowser.Navigate(requiredUrl);
}

private void webBrowser_Navigated(object sender, NavigationEventArgs e)
{
    // Actions related to navigation
}

Its throwing the Exception .

Answer 1

Nevermind,the problem is solved..

Move the webBrowser.Navigate(requiredUrl) to Windows_Loaded event.

       private void Window_Loaded(object sender, RoutedEventArgs e)
       {
         // Some code
          webBrowser.Navigate(requiredUrl);
       }

It's working fine now.

I think as Andy said the window needs a valid handle for the browser .

So it not working inside the MainWindow() function,as the handle for browser is not created in it.