Asp net validating date input
For this first example we do not need to place much code into the code-behind file. NET runtime does not waste time processing a request with invalid information.
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.
There are good reasons to always execute validation checks on the server.
Simply put, never trust the data in an incoming request, and always validate on the server.Before we look at the code sample, I would like to provide a little explanation of Regular Expressions.Regular Expressions are specially formatted strings for specifying patterns in text.If all of the fields contain valid information, the program displays a message dialog stating this and the program exits when the user dismisses the dialog. Before accepting data from over the network you need to ensure all of the required fields have been filled out and conform to your formats and business rules. NET provides a number of validation controls to ease the burden of performing validation on both sides of the network. To walk along with the example, create a new web application in Visual Studio . Once the application is setup, right click on the empty web form, select Properties from the context menu, and change the Page Layout property to Flow Layout. Notice we need to check the Is Valid property of the base class before performing any critical action in the submit event.