You are developing a

You are developing an ASP.NET Web page that contains input controls， validation controls， and a button named btnSubmit.  The page has the following code-behind.01 Public Class _Default  02 Inherits System.Web.UI.Page03   04 Protected Sub SaveToDatabase（）05   06 End Sub07   08 Protected Sub btnSubmit_Click（ByVal sender As Object，09 ByVal e As EventArgs） Handles btnSubmit.Click10   11 End Sub12   13 End Class  You need to ensure that all data that is submitted passes validation before the data is saved in a database. What should you do？ （）