C# ASP Post submission for navigation

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Job Description

I require a post script to successfully navigate from page 1 of results to page 2 of an external asp website.
this requires the Viewstate and page data to be submitted back to the site to get t the next page etc but for whatever the reason - I am failing.
I have already got a working login and search functionality but loading the next pages of results simply fails.

the site is: Registercompas.com

So its just the one part - navigating from one page to another.
I can provide the code being used to get to the results and you simply need to get it to load the next page.