Validating user input in a web forms page

These pairs let you define rules for both conditions: an error condition and a "normal" (non-error) condition.

It's important to understand that the markup for the error display is always rendered, even if there are no errors.

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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.The following example shows a page that illustrates these steps. code-cshtml Main] To see how validation works, run this page and deliberately make mistakes.For example, here's what the page looks like if you forget to enter a course name, if you enter an, and if you enter an invalid date: By default, user input is validated after users submit the page — that is, the validation is performed in server code.Performing validation in server code is a security measure, in case users bypass client-based validation.

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The following page shows how to add client validation features to the example shown earlier. code-cshtml Main] Not all validation checks run on the client.

A disadvantage of this approach is that users don't know that they've made an error until after they submit the page.

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