Get div class height

This is a method for obtaining the height of a DOM element using inline JavaScript using the headless browser Watin.

Install Watin first using Console for Visual Studio Nuget Package Manager by carrying out:

PM> Install-Package WatiN

After the Watin headless browser has been installed successfully, you can use it in the following way to access a website and execute a simple java script to get an element's height:

using WatiN.Core;
...

private void buttonGetElementHeight_Click(object sender, EventArgs e)
{
    WatiN.Core.Settings.Instance.MakeNewIeInstanceVisible = false;
    IE browser = new IE();

    browser.GoToNoWait("https://m.investing.com/economic-calendar/");
    browser.WaitUntilContainsText("Filters");

    var height = browser.Eval("document.getElementsByClassName('js-economic-calendar')[0].offsetHeight");
    labelResult.Text = String.Format("Element height is {0}px", height);

    browser.ForceClose();
}

Here is a screenshot of the active button that retrieves the height:

EDIT

You must provide some error handling for both the Watin objects in C# and embedded JavaScript that are being evaluated since this is a test.

UPDATE

How to do it usingWindows.UI.Xaml.Controls.WebView :

private async void webView1_LoadCompleted(object sender, NavigationEventArgs e)
{
    var offsetHeight = await webView1.InvokeScriptAsync("eval", new string[] {
        "document.getElementsByClassName('js-economic-calendar')[0].offsetHeight.toString()"
    });
    textBox.Text = offsetHeight;
}

private async void button_Click(object sender, RoutedEventArgs e)
{
    webView1.LoadCompleted += webView1_LoadCompleted;
    webView1.Navigate(new Uri("https://m.investing.com/economic-calendar/"));
}

My effective screen grab is: