How to generate and auto increment Id with Entity Framework

Question

Revised entire post.

I\'m trying to post the following JSON POST request via Fiddler:

{Username:\"Bob\", FirstName:\"Foo\", LastName         


        

Answer 1

This is a guess :)

Is it because the ID is a string? What happens if you change it to int?

I mean:

 public int Id { get; set; }