public static class Program {

    [System.Runtime.InteropServices.StructLayout( System.Runtime.InteropServices.LayoutKind.Explicit )]
    private struct Union {
        [System.Runtime.InteropServices.FieldOffset( 0 )]
        public System.Byte ByteField;
        [System.Runtime.InteropServices.FieldOffset( 0 )]
        public System.Boolean BooleanField;
    }

    [System.STAThread]
    public static System.Int32 Main( System.String[] args ) {

        var u1 = new Union {
            ByteField = 1
        };
        var u2 = new Union {
            ByteField = 2
        };
        System.Console.Out.WriteLine( u1.BooleanField == u2.BooleanField );

        return 0;
    }

}