Check out example codes for "finding holydays asp.net". It will help you in understanding the concepts better.
Code Example 1
PM> install-package Nager.Date
Code Example 2
var date = new DateTime(2018, 01, 01);
if (DateSystem.IsPublicHoliday(date, CountryCode.DE))
{
//Yes - New Year's Day
}
Code Example 3
var publicHolidays = DateSystem.GetPublicHoliday(2018, CountryCode.DE);
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