public void AddProductSellSignup(ActiveSignup signup)
{
AssertionConcerns.AssertArgumentNotIn(signup, ActiveSignups, $"{Reasons.DUPLICATE}: Cannot add a duplicate ActiveSignups");
ActiveSignups.Add(signup);
}
public void AddAttribute(ProductAttribute productAttribute)
{
AssertionConcerns.AssertArgumentNotIn(productAttribute, Attributes, $"Product Attribute Already Exists: {productAttribute}");
Attributes.Add(productAttribute);
}