Visual basic validating odd data input
If the posted form input is invalid, the action method redisplays the form with errors: After we’ve implemented our controller, we can right-click within one of its action methods and choose the “Add View” command within Visual Studio – which will bring up the “Add View” dialog.We’ll choose to scaffold a “Create” view that is passed a Person object: Visual Studio will then generate a scaffolded view file for us under the \Views\Friends\ directory of our project.Below I’m going to be using VS 2010 to implement the above scenario using ASP. You could also implement the exact same scenario using VS 2008 and ASP. We’ll begin by adding a simple “Person” class to a new ASP.NET MVC 2 project that looks like below: It has four properties (implemented using C#’s automatic property support, which VB in VS 2010 now supports too – woot! We’ll then add a “Friends Controller” controller class to our project that exposes two “Create” action methods.NET MVC will create a Person object and automatically map the incoming form input values to it.As part of this process, it will also check to see whether the Data Annotation validation attributes for the Person object are valid. Is Valid check within our code will return true – in which case we will (eventually) save the Person to a database and then redirect back to the home-page.
This is the second in a series of blog posts I’m doing on the upcoming ASP. This blog post covers some of the validation improvements coming with ASP. Validating user-input and enforcing business rules/logic is a core requirement of most web applications. NET MVC 2 includes a bunch of new features that make validating user input and enforcing validation logic on models/viewmodels significantly easier.By the conclusion of this Visual Basic for Excel training course, you will be familiar with the VBA programming language, as it applies to Microsoft Excel.You will be able to apply this knowledge to make interactive and fully functional spreadsheets.Let’s now update our application to enforce some basic input validation rules.We’ll implement these rules on our Person model object – and within our Controller or our View.