SitecoreContentSearch.Paging2.cs

using (var context = ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())  
{
  var results = context.GetQueryable<SearchResultItem>()
                       .Where(...)
                       .Skip(0).Take(20)
                       .GetResults();

  var numberOfSearchResults = results.TotalHits;
  var searchResuls = results.Hits;

  // From here, either return the results and the number of search results
  // to the UI, and calculate the number of pages etc., or simply just the 
  // SearchResults instance - that's up to you.
}