key_down event of DateTimePicker

I am using this DateTimePicker control in my UI.

I want my control to behave like when user presses 'd开发者_如何转开发elete' or 'backspace' key the value displayed on DateTimePicker control should be an empty string.

Intially I managed by setting its CustomFormat property to empty string so that when UI loads it shows as null.

I am using KeyDown event to check/verify if user has enterd Delete or Backspace key. Kindly help.

Manali

This should work for you. You need to reset the format back to your desired format (Long, Short, Time, Custom), before you can get a new value. Do this in the ValueChanged event.

    private void dateTimePicker1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Delete || e.KeyCode == Keys.Back)
        {
            dateTimePicker1.Format = DateTimePickerFormat.Custom;
            dateTimePicker1.CustomFormat = " ";
        }
    }

    private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
    {
        dateTimePicker1.Format = DateTimePickerFormat.Long;
    } 

When saving a value for the dateTimePicker, you can test if the dateTimePicker1.Format == DateTimePickerFormat.Custom, and then save the value as null in your database.

Enjoy!

  private void date_KeyDown(object sender, KeyEventArgs e)
        {
            if(e.Key == Key.Back || e.Key == Key.Delete)
                date.SelectedDate = null;
        }