This dialog is inherited from a standard .NET Windows Form and provides a method to select a date or a date and time using a monthly calendar and spinner-like controls for entering hours and minutes.
The form is designed to be called using ShowDialog to display as a modal dialog. Clicking OK or double-clicking a date will set the Selection property to the date/datetime shown on the dialog and will set the DialogResult property to DialogResult.OK. Clicking Cancel or pressing Esc will set the DialogResult property to DialogResult.Cancel. Note that the value of the DialogResult property is what is returned from the call to ShowDialog.