User control not validating
There are four key properties to initialize for a Range Validator.
The code in our ASPX file should look like the following.We have seen the Required Field Validator in our first sample program, let’s move on to examine the rest of the controls.The Range Validator control ensures the value inside a control is within a specified range.The associated control is set by right clicking on the validator and selecting Properties from the context menu. The rest of the validation controls provided by ASP.In the Properties dialog box find the Control To Validate property and select First Name Text Box from the drop down list. We can set other properties, such as the Error Message property, and the final ASPX source code should look like the following. NET work in a similar fashion to what we've seen above. If the client's web browser is of executing client side Java Script, the first validation pass occurs on the client.Simply put, never trust the data in an incoming request, and always validate on the server.
When validation fails the normal flow of execution continues.
Html Controls; namespace Web Data Validation When the user clicks the Cancel button we clear the Text Box control and allow the user to start over.
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.
Malicious users might circumvent client side validations in an effort to break-in or damage your servers.
We can double click on both of the Button controls on the form to add event handlers for the click events. If you want to disable just client side validation for a specific validation control, you can set the control’s Enable Client Script property to false. NET will always execute validation checks on the server when a button click event arrives requiring validation.