webbrowser control - check if all frames were loaded (alternative to “DocumentCompleted”)

Hello everyone!

I am writing a program that navigates through a website containing two frames. I am using WinForms webBrowser control. (I tried using Selenium, but I need the browser to be either visible or hidden according to users' need and Selenium cannot hide the browser control)

I had the same program written in visual basic script, where I have used the following code as a subprocedure to make sure that everything is loaded before trying to invoke click events etc.

Sub CheckIfLoaded
    Do while appIE.Busy = True OR appIE.ReadyState <> 4 : Wscript.Sleep(100) : Loop
End Sub

I am looking for something similar in C#. I don't think that WebBrowswer.DocumentCompleted event is the solution here, because as far as I understand the usage of it, I would have to put whole code into one webBrowser1_DocumentCompleted method in a large number of if statements, which seems really wrong.

The pseudo-code that shows my intentions would be:

private void DoOneSpecificThing (string[] ListOfThings)
{
    foreach (string ID in ListOfThings)
    {
      open webbrowser and navigate to page;
       CheckIfLoaded();
      Log In and load the first page;
       CheckIfLoaded();
      Tick a bunch of tickboxes, write in textboxes etc;
      Submit;
       CheckIfLoaded();
      Go to the next page;
       CheckIfLoaded();
      And do more stuff;
      Submit;
    }
}

There are a lot of procedures like that in my code (e.g. for logging in, for navigating to selected page, for filling forms, for setting options, for generating reports), so I would like to have one simple thing that would make sure that the page is loaded before trying to access its element, as I had in vbs.

I tried the following two solutions: (in the first one, the application never gets to load a page)

        int counter = 0;
        while (webBrowser.ReadyState != WebBrowserReadyState.Complete)
        {
            counter += 1;
        }

(in the second, the application doesn't actually wait for the page to load, so I tend to get null reference errors and this kind of stuff InvalidArgument=Value of 'nav' is not valid for 'windowId'.)

        while (webBrowser.ReadyState != WebBrowserReadyState.Complete)
        {
            Application.DoEvents();
        }

Help will be greatly appreciated! I have a feeling that Application.DoEvents() is a wrong way to go, but I have no idea what to do and whole Internet says "just put your code in "DocumentCompleted" event.
Thanks in advance!

Bartosz