title: Asp.Net Boilerplate InsertAsync method not work and return negative id
body: <p>I want to know which cases entity failed to add and return negative id?</p>
  
  <p><a href="https://i.stack.imgur.com/n8jw3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/n8jw3.png" alt="enter image description here"></a></p>