Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.
You might also have certain restrictions on the values.
When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.
However, the test will be performed in server code.
You can control how validation errors are displayed by defining CSS classes that have the following reserved names: .
This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.
For example, you don't want to process a form that's missing critical information.
For example, if a page has an element as a placeholder for an individual field error, even if there is no error.
In some situations, displaying an error message can cause the page to reflow and can cause elements on the page to move around.The CSS rules that end in to both have the same fixed size.That way, the display area for the field is static and won't change the page flow if an error message is displayed.In that case, the validation is performed as users work in the browser.For example, suppose you specify that a value should be an integer.If a user enters a non-integer value, the error is reported as soon as the user leaves the entry field.