Check if dateTime is a weekend or a weekday

Answer 1

You are comparing your ASP.NET label dayToday against an enumeration element of DayOfWeek which of course fails

Probably you want to replace dayToday with day in your if statement, i.e. from

if ((dayToday == DayOfWeek.Saturday) && (dayToday == DayOfWeek.Sunday))

to

if ((day == DayOfWeek.Saturday) && (day == DayOfWeek.Sunday))

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In addition, you probably also want to replace the logical 'and' (&&) with a logical 'or' (||) to finally

if ((day == DayOfWeek.Saturday) || (day == DayOfWeek.Sunday))