Is it correct to use a function to create a handler?

Question

OOP

Is it correct to use a function to create a control handler?

public static void Validate(ValidateType type, Control control)
        {
            switch (type)
            {
                case ValidateType.OnlyNumbers:
                    {
                        control.KeyPress += ValidNumbers;
                        break;
                    }
                case ValidateType.OnlyText:
                    {
                        control.KeyPress += ValidNumbers;
                        break;
                    }
                    
            }

Answer 1

In the validation event, it is already too late to subscribe to KeyPress, the handler will not work. You need to subscribe earlier, and call Validate in the event handler.