Question

I want to do something after the document have completely load… I dont want to use WebBrowser.DocumentCompleted Event, so please don’t suggest me this.

I tried 2 ways to do it but they not work. Can someone tell me what I doing wrong?

Example 1

wb.Navigate("http://www.google.com");
while(wb.ReadyState != WebBrowserReadyState.Complete) { }
richtextdocument.Text = wb.DocumentText;

Example 2

wb.Navigate("http://www.google.com");
while(wb.isBusy == true) { }
richtextdocument.Text = wb.DocumentText;

Answer 1

What you are dealing with here is trying to call an inherently asynchronous method synchronously.

As you mentioned in the comments to your question that the reason for not using DocumentCompleted is that you will need to use that event for other purposes, what I suggest you do is to use the DocumentCompleted event, coupled with a private class boolean flag to determine if this is the special case of DocumentCompleted or not.

private bool wbNeedsSpecialAction; //when you need to call the special case of Navigate() set this flag to true

public Form1() 
{
    InitializeComponent();         
    wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
}

void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    if (wbNeedsSpecialAction)
    {
        richtextdocument.Text = wb.DocumentText;
        wbNeedsSpecialAction = false;
    }
    else
    {
        //other cases of using DocumentCompleted...
    }
}

public void Browse()
{
    wbNeedsSpecialAction = true; //make sure the event is treated differently
    wb.Navigate("http://www.google.com");
}

This will still allow you to control other cases within the event handler.

You must take special care to ensure that your user is not able to trigger another call to Navigate() before this ‘special action’ page finishes loading, otherwise it may steal the special case event. One way could be to block the UI until the page finishes loading, e.g.:

Cursor.Current = Cursors.WaitCursor;