C# DatePicker Validating Date

Question

DatePicker allows selecting a date.

UPDATE: I would like to force DatePicker to allow only entry as dd/mm/yyyy. So, if user tries to enter "December 21, 2015" it would not allow it.

I am in .NET Framework 4.5

Answer 1

To catch cases where the text typed into the DatePicker is not a valid date format you should handle the DateValidationError event . You'll get passed a System.FormatException if the format isn't acceptable.

To limit the drop-down Calendar to the current year you can set the DisplayDateStart and DisplayDateEnd properties - but that doesn't stop you typing other dates in the text box.

MyDatePicker.DisplayDateStart = new DateTime(DateTime.Now.Year, 1, 1);
MyDatePicker.DisplayDateEnd = new DateTime(DateTime.Now.Year, 12, 31);

To limit the DatePicker to the current year set the BlackoutDates property to exclude all dates other than the current year. For example:

// Exclude all dates before the start of this year
MyDatePicker.BlackoutDates.Add(
   new CalendarDateRange(DateTime.MinValue, new DateTime(DateTime.Now.Year - 1, 12, 31)));
// Exclude all dates after the end of this year
MyDatePicker.BlackoutDates.Add(
   new CalendarDateRange(new DateTime(DateTime.Now.Year + 1, 1, 1), DateTime.MaxValue));

A validly formatted date that falls into one of the blackout date ranges will cause an ArgumentOutOfRangeException to be passed to the DateValidationError event handler

Answer 2

Use the following code:

DateTimePicker.Format = DateTimePickerFormat.Custom
DateTimePicker.CustomFormat = "dd-MM-yyyy"

Answer 3

Try this to validate the date range starting from today to 30 more days.

System.DateTime today = System.DateTime.Today;

this.DateTimePicker.MinDate = new System.DateTime(today.Year, today.Month, today.Day);

this.DateTimePicker.MaxDate = today.AddDays(30);