Is the ASP.NET Validator a trustworthy tool?

Utilizing the ASP.NET Validator to validate numerous inputs in my WebForm has proven effective on the client side. I appreciate being able to validate inputs without triggering a page reload.

However, when attempting to use the Validator on the code behind, the Page.Isvalid attribute raises questions about its reliability. The following inquiries have left me perplexed:

  1. Can the Validator be trusted for client-side validation? (Apart from disabling javascript, is it susceptible to manipulation?)
  2. How does the Validator access validity information on the server side? (Does it rely on generated C# Validator code or directly retrieve data from the client-side?)

I've included the code snippet below that I implemented to validate inputs on the server side as well:

foreach (IValidator iValidator in Page.Validators)
            {
                if (!iValidator.IsValid) { return false; }
            }

Yet, can this method function independently of .aspx and .js files? Is it a dependable approach for server-side validation?

c#javascript.netvalidationcode-behind

Answer №1

It is essential to validate data on the server side as well, which can be automated by using the Page.Validate method.

According to information from MSDN:

The CausesValidation property is set to true by default and is triggered when a user interacts with ASP.NET server controls such as Button, ImageButton, LinkButton, HtmlInputButton, HtmlInputImage, HtmlButton, as well as HTML server controls that can automatically submit to the server like TextBox, CheckBox, ListControl, and BulletedList.

If you need to validate a specific ValidationGroup, you can manually trigger it:

Page.Validate("MyValidationGroup");
If(Page.IsValid)
{
    // ...
}

Remember to only check Page.IsValid after invoking Page.Validate or setting the CausesValidation property to true in the OnServerClick event handler for an ASP.NET control initiating form submission.

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