Tired of static calendars that just display the dates and nothing more? In this article, we will use ASP.NET and Microsoft Visual Studio 2012 to customize calendar controls in such a way that it will display all holidays in red. Since holidays are location specific, you will need to define holidays into the database to show the dates in red in the calendar if it has the holiday you listed in the database. The article will also demonstrate how you can customize the tool tip in the calendar on that particular date. You will need to create a new website and add forms to create a calendar and customize the holidays to be shown in red.