System.nullreferenceexception: object reference not set to an instance of an object.

[Activity(Label = "WebViewOpen", MainLauncher = false)]
public class WebViewOpen : Activity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        
        base.OnCreate(savedInstanceState);
        //var view = FindViewById<WebView>(Resource.Id.webView1);
        var webView = FindViewById<WebView>(Resource.Id.webView1);

        //WebView webView = FindViewById<WebView>(Resource.Id.webView1);
        
        webView.Settings.JavaScriptEnabled = true;
        webView.Settings.BuiltInZoomControls = true;
        webView.Settings.SetSupportZoom(true);
        webView.ScrollBarStyle = ScrollbarStyles.OutsideOverlay;
        webView.ScrollbarFadingEnabled = false;
        webView.SetWebViewClient(new WebViewClient());

        using (var _client = new HttpClient())              //neu
        {
            //SetContentView(Resource.Layout.home);
            _client.BaseAddress = new Uri("https://a***/");

            
            
            view.SetWebViewClient(new WebViewClient());

            //String postData = "uname=101670&pwd=hallowelt2018";

            _client.BaseAddress = new Uri("https://a***/");

            
            using (var client = new HttpClient())
            {
                var content2 = new FormUrlEncodedContent
                (new[] { new KeyValuePair<string, string>("uname", "***"),
                new KeyValuePair<string, string>("pwd", "***"),
                new KeyValuePair<string, string>("action", "login"),
                new KeyValuePair<string, string>("src", "app") });
                client.BaseAddress = new Uri("https://a***/");
                var response2 = client.PostAsync("/", content2).Result;
                string result2 = response2.Content.ReadAsStringAsync().Result;

                //webView.LoadData(result2, "text/html", "UTF8");
                
            }
        }
    }
    
}

var view = FindViewById<WebView>(Resource.Id.webView1);

WebView webView = FindViewById<WebView>(Resource.Id.webView1);