Windows forms to login on instagram and get a variable

I have an application (in C# windows forms) which grabs and saves instagram images based on a hashtag. It was working very well and it stopped because Instagram implemented a new feature, which requires my application to authenticate and then I will be able to retrieve the images. My application uses InstaSharp dlls ([login to view URL]) , which already contains all necessary classes to do the job I want, so what is missing now is implement the authentication and pass it to the methods the application already have. So what I need is you just to implement the first part (authentication): a windows application which shows a webbrowser inside then I will authenticate on instagram and , using my client secret and client id (I will give to you), it will store the oauthResponse in a variable. With this variable available, I can pass to my existing methods.