Selects a range of text in the spin box (also known as an up-down control) specifying the starting position and number of characters to select.
The UpDownBase.Select(int, int) method can be used when the spin box gets focus, or when the UpDownBase.Text property fails data validation. When adding the validation code for the UpDownBase.ValidateEditText method in a derived class, call the UpDownBase.Select(int, int) method when validation fails.