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You also saw how to use the API to programmatically create contact persons and their contact data and save those in a database. When that you don't want to update when you're changing an existing item.

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If you haven't read part one or two yet, you should really read them first, as this article uses many concepts that have been explained in part one and two. The final piece of interesting code in this page is inside the Save button's click handler. Get Item(contact Person Id); } else { // Create a new Contact Person my Contact Person = new Contact Person(); } my Contact Person. You saw how this worked in the previous article in this series. Active View Index = 1; break; case "phonenumbers": gv Contact Persons. If you look in the code behind, you see the following regions and the That seems like a lot of steps for something as simple as inserting an e-mail address in the database.

The entire series (including this current article) can be found here: The article uses a SQL Server 2005 Express database which is easy to use in development scenarios. This code is fired when all the client side validators have done their work. At the end, when the object was saved successfully, the code calls the custom method page. Remember, though, that most of these steps take place in the framework that was developed earlier.

However, the downloads for this series also come with the T-SQL scripts to recreate the database in SQL Server 2000 or SQL Server 2005. The code for the handler looks like this: protected void btn Save_Click(object sender, Event Args e) { Page. You can see that with the Business Objects, Business Logic and Data Access Layers built, it's quite easy to create web pages that allow users to manage objects in your system. Active View Index = 0; break; case "emailaddresses": gv Contact Persons. In fact, from an ASPX page perspective, all you need are the controls and the code in the event.

- I have written a new series on N-Layer design targeting ASP. How do these business objects interact with other parts of the system? As other alternatives, you could drop the entire Calendar and use three drop down instead for the year, month and day or use the new Calendar control from the Ajax Toolkit that features some cool ways to browse through the calendar.

It builds on the foundation created in this first series, but digs much deeper into concepts like Validation, Sorting, Paging, Concurrency and Security. What should these objects be capable of and how do they look. Instead, you could add an additional drop down with the years that could allow a user to quickly select the relevant year.

- I have written a new series on N-Layer design as a major follow up to this one. Part one dealt with the design of the application: what business objects do you need to fulfill the requirements of the application. Note that the current implementation for the calendar isn't very user-friendly for a birth date. This means you'll need to click around 420 times (35 * 12) to get at the right month back in 1971. The target audience for this series are developers that are ready to make the switch from using controls with custom business objects. NET 2 and C# is necessary while some knowledge about object oriented design certainly helps. Save(my Contact Person); End Editing(); } } when no date has been selected. This is part three of the article series "Building Layered Web Applications" that shows you how to build N-Layer applications with Microsoft ASP. These articles teach you how to design, build and use custom business objects in your web application. For more information about the translation, check out this blog post.Part two showed you how to code the classes that were designed in part one. However, for the purpose of demonstrating n-layer design, the Calendar control is fine.You saw how to implement the data access methods and database code and how the various classes were able to work together. Once the date has been checked, the code determines whether we're editing an existing item, or creating a new one.

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