Previously I tried Behrooz Moghaddam's code but using the default winforms DateTimePicker control, but that code didn't work.
Now I am using the telerik RadDateTimePicker
and write this code after InitializeComponent()
and instead of "fa-IR"
use your culture.
Application.CurrentCulture = new CultureInfo("fa-IR");
radDateTimePicker1.Format = DateTimePickerFormat.Custom;
radDateTimePicker1.CustomFormat = Application.CurrentCulture.DateTimeFormat.ShortDatePattern;