Hello, so I want my WebControl to rotate through different URLs with a timer without reloading the pages each time. To do this I am creating a WebView for each page that I want to display and change the assigned WebView of the WebController with a timer.

As of now I created 2 different WebView objects. I assign the first WebView to the WebControl, the timer then triggers the event which assign the second WebView to the WebControl (everything is fine), however when I switch back to the first WebView I get the following exception:

System.NullReferenceException: Object reference not set to an instance of an object.
at EO.Internal.a9b.b(Boolean A_0)
at EO.WebBrowser.WebView.al(cm A_0, ar7 A_1)
at EO.WebBrowser.WebView.a(cm A_0, ar7 A_1)
at EO.WebBrowser.WebView.b(cm A_0, ar7 A_1)

When debugging I look at the properties of the first WebView and the values of the WebView are still there like the URL, so it seems like the WebView was not deleted.

This is the method I call with the timer:
// Called by the timer to change the WebView of the WebController.
protected void SwitchTab(object source, ElapsedEventArgs e)
{
if (this.webControl.WebView == this.webView)
{
this.webControl.WebView = this.webViewTwo;
}
else if (this.webControl.WebView == this.webViewTwo)
{
this.webControl.WebView = this.webView;
}
}

Thanks, I just fixed it by doing what you described except that I created two WebControls and changed their visibility.