Check

Check static class with its methods provides functionality for determining if some variable's value meets specified conditions.

IsInRange

Determines whether specified string value length lays in provided boundaries with inclusion:

Check.IsInRange("123", 4, 8); // --> false
Check.IsInRange("123456", 4, 8); // --> true

Same method for DateTime determines whether specified value lays in provided boundaries with inclusion:

Check.IsInRange("1980-01-01", DateTime.Parse("1990-01-01"), DateTime.Parse("2022-12-31")) // --> false
Check.IsInRange("2000-05-30", DateTime.Parse("1990-01-01"), DateTime.Parse("2022-12-31")) // --> true

There are similar methods for checking IsGreaterThan and IsLessThan conditions.