I am using webview for parsing my HTML data. For this, I am using a custom render.

**In the Main Project:**

```
public  class MyWebView : WebView
{
    public static readonly BindableProperty UrlProperty = BindableProperty.Create(
    propertyName: "Url",
    returnType: typeof(string),
    declaringType: typeof(MyWebView),
    defaultValue: default(string));

    public string Url
    {
        get { return (string)GetValue(UrlProperty); }
        set { SetValue(UrlProperty, value); }
    }
}

```

**Ios Renderer**

```
public class MyWebViewRenderer : ViewRenderer<MyWebView, WKWebView>
{
    WKWebView _wkWebView;
    protected override void OnElementChanged(ElementChangedEventArgs<MyWebView> e)
    {
        base.OnElementChanged(e);

        if (Control == null)
        {
            var config = new WKWebViewConfiguration();
            _wkWebView = new WKWebView(Frame, config);
            SetNativeControl(_wkWebView);
        }
        if (e.NewElement != null)
        {
            Control.LoadHtmlString(Element.Url, null);   //use this code instead
            //Control.LoadRequest(new NSUrlRequest(new NSUrl(Element.Url)));
        }
    }
}

```

In XAML and XAML.cs:

```
<local:MyWebView 
    x:Name="web_view"
    VerticalOptions="FillAndExpand"/>

web_view.Url = htmldata;

```

But I am getting `System.ArgumentNullException` when running the project.

**Screenshots:**

[![enter image description here](https://i.stack.imgur.com/1JuVX.png)](https://i.stack.imgur.com/1JuVX.png)