How to get access token from browser?

Yes . I tried this one(my first try). Currently I'm using this method:

 Uri authorizeUri = DropboxOAuth2Helper.GetAuthorizeUri(OauthResponseType.Token, appKey, RedirectUri, state: oauth2State);

And then I called  System.Diagnostics.Process.Start(authorizeUri.ToString()) to open the browser with authorizeUri. Next step is that the user copies the responseUri to a textbox and then I have another button GetTokenBtn which calls ParseTokenFragment(responseUri) to obtain the token. 

Simply said , what I  wanted was to open a the browser,which contains the authentification(email and password of dropbox user to skip authentification) with authorize uri , then the resulting uri(responseUri) from the browser to be sent back to my application and then to call from my application ParseTokenFragment(responseUri) to obtain my token.

If that is not possible without searching into opened processes that will remain my solution.

Thanks for your support