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        static void Main(string[] args)
        {
            var a = null && true;
            var b = null && false;
            var c = null || true;
            var d = null || false;
            Console.WriteLine("{0} {1} {2} {3}", a, b, c, d);
        }

Error	1	Operator '&&' cannot be applied to operands of type '<null>' and 'bool'
Error	2	Operator '&&' cannot be applied to operands of type '<null>' and 'bool'
Error	3	Operator '||' cannot be applied to operands of type '<null>' and 'bool'
Error	4	Operator '||' cannot be applied to operands of type '<null>' and 'bool'