public DeleteModel(ShoppingList.Data.GroceryContext context)
 {
     _context = context;
 }
 public EditModel(ShoppingList.Data.GroceryContext context)
 {
     _context = context;
 }
 public CreateModel(ShoppingList.Data.GroceryContext context, UserManager <IdentityUser> um)
 {
     _context = context;
     _um      = um;
 }