User input had to be validated so that an incorrect piece of information would not be entered.User input had to be validated so that the information stored was standardized.
It makes analyzing, reporting and then acting on your data easier when it all conforms to certain formatting.
Email addresses, phone numbers, even IP addresses are easy to collect with the proper answer formatting that is built into Survey Gizmo.
In this way, we can bring certain degree of discipline in end user.
We can understand validation under two categories: Client side validation and Server side validation.
This is most secure form but comes at cost of performance. NET introduced smart validation server controls to implement page level validations. Usually, Validation is invoked in response to user actions like clicking submit button or entering data.
They are capable of performing both server side and client side validations. It also added new features like Validation groups and new Java Script capabilities. Suppose, you wish to perform validation on page when user clicks submit button.
Back when we had only ASP, developers who had to write webpages for forms knew that the most tedious part is writing code to validate the user input.
User input had to be validated so that malicious use of the pages couldn't be achieve.
The nice thing about these Validation controls is that it will perform client-side validation when it detects the browser is able (unless client-side validation has been disabled). The Error Message tag is shown in the Validation Summary (see below). Usage of this Compare Validator is for confirming new passwords, checking if a departure date is before the arrival date, etc.
We'll start off with a basic example: The data type can be one of: Currency, Double, Date, Integer or String, string being the default data type.
In a Win Form I'm doing initial validation in the Form. To make the code short only three fields are shown in the code.