Enum Casting from Form field

main.cs

public class IndexController : Controller {
        public void Index() {
            string form_value = "Change";
            Item i = new Item();
            i.MaterialCode = (MatCode)Enum.Parse(typeof(MatCode), form_value);
        }
}

public class Item {
    public MatCode MaterialCode = new MatCode();
}

public enum MatCode{
    A = "Add",
    C = "Change"
}