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Notice in the following screen capture, we can see the Required Field Validator error message display on the form. The user does not wait on a server round trip to discover errors.

This is the exact position the error message will appear if validation fails. This also improves response time on the server because the ASP.

There are good reasons to always execute validation checks on the server.

Not executing server side validation leaves your application code vulnerable to malicious users.

There are various validation controls availabe, and we will cover them in the rest of the article.

Correct the entered value or discard changes to continue working with the grid control. If a value's validity depends on other values within the same row, you can enable row validation by handling the Column View. For instance, make sure that values in one column are greater than values in another column.

Run the application, enter the invalid value and try to switch focus to another row.

Malicious users might circumvent client side validations in an effort to break-in or damage your servers.

Simply put, never trust the data in an incoming request, and always validate on the server.

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