title: How to add asp-subarea to form tag helpers in asp.net core 2.2
body: <p>I'm developing an asp.net core 2.2 project and due to hierarchy of menu levels I had to create subareas (Controllers, views, etc.), so I followed a <a href="https://www.c-sharpcorner.com/article/expanding-razor-view-location-and-sub-areas-in-asp-net-core/" rel="nofollow noreferrer">c-sharpcorner article</a> relate with that and it worked succeded, however article doesn't mention about creation of <strong>asp-subarea</strong> form attribute tag helper, I read about <a href="https://docs.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/authoring?view=aspnetcore-2.2" rel="nofollow noreferrer">Microsoft author tag helpers</a> but is not very clear for me since asp-subarea depends on other attributes like <strong>asp-area</strong> and <strong>asp-controller</strong> to build the final action attribute into the form tag.</p>
  
  <p>I'd appreciate any help about. Thanks</p>