C＃如何打开网页并单击按钮

Question

I have a problem to solve.

A button has this code:

WebBrowser wb = new WebBrowser();
wb.Navigate(link, true);
wb.Document.GetElementById(idname).InvokeMember("click");

I have a NullReferenceException on the GetElementById because when I reach it, the page is "white". If I comment the GetElementById, the page is opened correctly.

Thanks

Answer 1

Here it is:

private WebBrowser _wb = new WebBrowser();

public FormMain()
{
    _wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
    InitializeComponent();
}