What is "System.Windows.Navigation" assembly in Windows Form Applications

Question

i am trying to add these codes :

public partial class My_SyS : Form
{
    List<Uri> HistoryStack;
    int HistoryStack_Index;
    bool fromHistory;

    public Sisi_Start()
    {
        InitializeComponent();

        HistoryStack = new List<Uri>();
        HistoryStack_Index = 0;
        fromHistory = false;
        webBrowser_main.Navigated += new EventHandler<System.Windows.Navigation.NavigationEventArgs>(webBrowser_main_Navigated);
        updateNavButtons();
    }

    ....

and here is webBrowser_main_Navigated event :

private void webBrowser_main_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
{
}

i got the error below :

The type or namespace name 'Navigation' does not exist in the namespace 'System.Windows' (are you missing an assembly reference?)

which assembly should i use for the reference?

Answer 1

Add reference to System.Windows.Navigation in the PresentationFramework (in PresentationFramework.dll) Assembly