c# - how to webpage textbox onclick event fire from winform textbox

Question

I have below code,when i search from my winform textbox and click search button but webpage text box onclick event not fired. How to do this? here is :http://www.heathrow.com/arrivals when i click search button page still same position, show in 2nd number image. internet explorer 11 i have installed

private void button2_Click(object sender, EventArgs e)
{
      HtmlDocument doc = webBrowser1.Document;
            HtmlElement HTMLControl2 = doc.GetElementById("searchInput");

            if (HTMLControl2 != null)
            {
                // HTMLControl2.Style = "display: none";
                HTMLControl2.InnerText = textBox1.Text;

                HTMLControl2.Focus();

                SendKeys.SendWait("{ENTER}");
                textBox1.Focus();

            }

}

Answer 1

Here is the code:

Form1.cs:

private void textBox1_TextChanged(object sender, EventArgs e)
{
    HtmlDocument doc = webBrowser1.Document;
    HtmlElement HTMLControl2 = doc.GetElementById("searchInput");

    if (HTMLControl2 != null)
    {
        // HTMLControl2.Style = "display: none";
        HTMLControl2.InnerText = textBox1.Text;

        HTMLControl2.Focus();

        SendKeys.SendWait("{ENTER}");
        textBox1.Focus();

    }
}

Anything else is default.