Calling a Javascript function in the C# webBrowser control

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Can you specify what failed?

My sample below consists of a form with a WebBrowser and a Button.

The object called y in the end has the sentence “i did it!”. So with me it works.

public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();

            webBrowser1.DocumentText = @"<html><head>
                <script type="text/javascript">
                    function doIt() {
                        alert('hello again');
                        return 'i did it!';
                    }
                </script>
                </head><body>hello!</body></html>";

        }

        private void button1_Click(object sender, EventArgs e)
        {
            object y = webBrowser1.Document.InvokeScript("doIt");
        }
    }

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