Creating Full calendar

To display a complete calendar for a year in an ASP.NET MVC application and allow users to select multiple days to save as holidays, you can follow these steps:

1. Create a Model: Define a model that represents the selected holidays. This model should include properties for the year and a collection of selected dates.

2. Create a View: Design a view that displays a calendar for the entire year. You can use HTML tables or a JavaScript library like FullCalendar for this purpose.

3. Populate the Calendar: In the view, dynamically generate the calendar by iterating through the months and days of the selected year. Style the calendar to highlight weekends and other relevant details.

4. Select Dates: Implement JavaScript to allow users to select multiple dates on the calendar. Highlight selected dates visually.

5. Submit Selected Dates: When the user submits the selected dates, send them to the server using an AJAX request or a form submission.

6. Server-Side Handling: In the controller, handle the selected dates and save them as holidays in the database, associating them with the specified year.

7. Display Holidays: Optionally, you can create another view to display the holidays for the selected year, allowing users to edit or delete them.

In This Function, You Have to Pass The Year And Get The  Full Year Calender.  

private List> GenerateCalendarData(int year)
        {
            List> calendarData = new List>();

            // Loop through each month of the year.
            for (int month = 1; month <= 12; month++)
            {
                // Calculate the days in the current month.
                int daysInMonth = DateTime.DaysInMonth(year, month);

                // Loop through each day in the month and add it to the list.
                for (int day = 1; day <= daysInMonth; day++)
                {
                    DateTime date = new DateTime(year, month, day);
                    string dayName = date.ToString("dddd"); // Get the day name.

                    calendarData.Add(new Tuple(date, dayName));
                }
            }

            return calendarData;
        }