use camelcase in angular and asp.net web api jsonset

`example here =>
namespace DirectoryApi
{
public class Directory
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Telephone { get; set; }
}
}

you can use FirstName but json returns firstName. if you use it like this =>

*ngFor