How to run progress bar during one page to another page load

Question

Hello,
 
I have Four forms in my c# .net windows application, when i am clicking second form's button and then loading another third form, but it's loading very slow.
I want to run Progress Bar between these two forms, my progress bar will have to run until second form's fully load with third's form controls.

I have used BackgroundWorker process but did not success because some time progress bar running after form loaded.

How is it possible?

Please give me any solution for this.

 
Help me.
 
Thanks in Advance.
 
Ankit Agarwal
Software Engineer