The Required Field Validator is actually very simple, and yet very useful.
The server side validation routine should be written in any . The summary displays the values of the Error Message property of all validation controls that failed validation.He is a published author on several subjects including XML, the migration from Visual Basic 6 to VB. In this scenario, if an error occurs while performing validation on the user's computer, the application can directly display the error message on the page that the user is viewing without the page making a round trip to the Web server and then back to the user. NET, data validation was performed through scripts using either Java Script or VBScript.If the user enters invalid data they’ll see an icon shown in Figure 3.After the validating event returns without being cancelled, meaning we have valid user input, then the validated event will be raised.We will change this by adding an onclick event to it: As you will notice, we check whether or not the page is valid, before we do anything.