How do validation controls work

If we write the wrong email-id, then the error message appears on the form. Now, we need to check the password validation. If we are writing a different password into the password textboxes, then the error message appears on the web form.

Now, we need to check the validation of the dropdown list. If we don't select the country name, then the following error message appears: "plz select your country name".

When all the textbooxes have been filled, select the country name. Now, on clicking the submit button, the following message appears. View All. Validation Controls in ASP. Yatendra Sharma Updated date May 19, Since with client-side validation, we can reduce unnecessary round trips to the server. By that, we make our application more responsive and the user will get immediate feedback. RequiredFieldValidator control is used to checks data is entered into the attached control.

The syntax of the required Field control is as given:. In this example, I create two textboxes for username and password. If I submit the form without filling username and password then the page show errors Please enter a username and Please enter password. Compare validator is used to compare the value of two controls or with a fixed value. It has the following specific properties:. This example demonstrates you how can we compare to date field using asp. In this example I compare the current date with the date entered by user..

This example demonstrates you how can we set the range of text field using asp. The RegularExpressionValidator is used to validating the input value by matching against a pattern of a regular expression and it is set in the ValidationExpression property. The custom validator is used both the client side and the server side validation. It allows writing application-specific custom validation routines.

Validation summary does not perform any validation but shows a summary of all errors on the page. So it seems like there are more benefits than the disadvantages. Learn more. How do ASP. Ask Question. Asked 5 years, 11 months ago. Active 5 years, 4 months ago. Viewed 1k times. I am confused about client side and server side validation in ASP. So how does it work without posting back to the server?

Improve this question. Dan Lowe Aamir Aamir 3 3 silver badges 23 23 bronze badges. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy.

By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy. Net Tutorial » ASP. It is used to indicate to ASP. Net that the control is available at the server side as well. Making the control available at the server side helps in accessing the control in the code-behind logic.

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