Why you need validation in your web application?

Hi folks,

Did you ever use ASP.NET validation controls?

If you never heard or never use it before, see on the toolbox at the “validation” group.

Those are all validation controls.

- RequiredFieldValidator

- RangeValidator

- CompareValidator

- RegularExpressionValidator

- CustomValidator

- ValidationSummary

The main point of this control group is to be used to validate the input form entered by user before doing any postback.

But why?

As we can implement validation easily in code-behind.

Right?

It had to say Yes and No.

Yes, because validation coding in server-side (code-behind) is easier to code.

No, because while you know at the client that the data is invalid. Why you will let user postback to server?

Waste of bandwidth.

Totally waste!

This is the main reason why you have to use validation controls in your web forms.

Because it’ll help to reduce the unnecessary roundtrip between client and web server.

This will not affect much on the application that consumes less resource.

But it will be a big pain on the application that consumes much resource.

So, when you are dealing with input form.

Always use validation controls!

I know it will help you much.