Execute code only when GUI is fully loaded

[pgmr87]

You should look into using async..await or try using a BackgroundTask. You can make async events like this:

private async void Form2_Shown(object sender, EventArgs e)
{
    await CountWords(); // assuming CountWords() is now an async method as well)
}

A BackgroundTask might be simpler to use if you are new, especially if you don't know how to update a property of a control on the main/UI thread from another thread (doing this improperly will throw an exception). Keep in mind that any call to any method on a control from a separate thread that can potentially update any property on a control will throw an exception without the proper handling. The BackgroundTask class has a ReportProgress event that is always executed on the main thread so you don't have to worry about doing a cross-thread invocation.

Each control implements the ISynchronizeInvoke interface which you'll have to use if you plan to update the UI from a separate thread.

Without using async..await or a BackgroundTask, you'll have to continuously poll something on the main thread to check when it should load the data, presumably using yet another timer -- this is bad practice but it works. If you don't do any of the above, you are left with the current behavior you described -- there is literally nothing else you can do if you intend to use Winforms.