C# MaskedTextBox -- ignore BLANK text ?

How can I change the below so when users remove a date from the below TEXTBOX and click "TAB" it goes to the next control ?

Currently FOCUS remains on the current control and their only option is to enter a bogus date like 09/09/2099.

        private void dATE_DISTRUBUTEDMaskedTextBox_Validating(object sender, CancelEventArgs e)
        {
            if (dATE_DISTRUBUTEDMaskedTextBox.Text == "  /  /")
            {
                e.Cancel = true;
            }
        }