csharp binary operators sample

1. declaring values to be masked : all must be pow2

public enum EnumInvoiceFlags
{
    LateFeeApplied = 1,
    DelinquencyApplied = 2,
    Unfreezed = 4
}

applying masks:

 invoice.Flags = invoice.Flags | (int)EnumInvoiceFlags.DelinquencyApplied; 

checking if mask has specific value:

 
if ((invoice.Flags & (int)EnumInvoiceFlags.DelinquencyApplied) != (int)EnumInvoiceFlags.DelinquencyApplied)