Chain of responsibility

Label.cs

public class Label
{
    private Label(string Result)
    {
        Value = Result;
    }

    public string Value { get; }

    public static Label ApprovedOn => new Label("approvedOn");
    public static Label ApprovedOff => new Label("approvedOff");
    public static Label ReprovedOn => new Label("reprovedOn");
    public static Label ReprovedOff => new Label("reprovedOff");
}