By Vincent Varallo
The ASP.NET firm program improvement ebook, that is a part of the Problem/Design/Solution sequence, is setup as a ebook that illustrates the matter first, then strikes to the layout (and seems at numerous layout possibilities), and winds up with the answer to enforce. The pattern undertaking for this ebook is a time-tracking chance, an program to log employee's time.
Each bankruptcy of the publication seems to structure the basics of a enterprise program, beginning with the information entry, enterprise, and presentation layers. the remainder of the booklet is spent taking a look at a few of the positive factors that the appliance wanted (exception dealing with, defense, workflow, etc.). lots of the eventualities within the chapters use a code-specific implementation to fixing the matter, instead of utilizing different instruments to be had to builders (for example, the workflow bankruptcy does not leverage home windows Workflow Foundation). even though there are a number of instruments used, like Crystal stories and company Library.
The ebook has a fascinating technique in the way it implements the enterprise common sense; company functions are a lot various than own sites and different program forms simply because they rely on the good fortune in their company principles. that's one of many focuses of the ebook, constructing the way to constitution your code so you could deal with a number of the enterprise wishes of the application.
The chapters that create particular good points for the appliance (reporting, workflow, etc.) use a code-specific method of developing those positive aspects. The e-book lays out the alterations to the database and information version, illustrates the saved techniques for the swap, after which strikes into the layout answer. every one new characteristic has a brand new ASP.NET web page that he demonstrates absolutely besides any alterations to types, grasp pages, and so forth. every one publication discusses the bankruptcy to the fullest aspect, from the proc to the completed solution.
The kind of the booklet quite often follows the reason of the company challenge in the beginning. whilst the booklet illustrates code, the writer exhibits the code first, and follows up with an evidence of the answer. within the layout part, the booklet does talk about some of the elements that it does use to accomplish the answer (such as Crystal reviews for reporting and firm Library for exception handling).
While i do not understand that i'd use a similar structure, I do like a number of the positive aspects he carried out within the app and glance to determine how i'll make the most of this for my very own improvement.
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Additional resources for ASP.NET 3.5 enterprise application development with Visual studio 2008: problem, design, solution
You can either manually update the class or open the Object Relational Designer and delete and drag the table onto the design surface. I prefer to use the Object Relational Designer. After the Version field is added in your ENTUserAccount class, try the example again. This time you get the following error: SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM. You get this error because the InsertDate is not set. Change the code to fix the object initializer to set the InsertDate and the InsertENTUserAccountId and run the code again.
To accomplish this, you can add a datetime field or an int field that is incremented each time a record is updated. When you retrieve the record from the database, you need to persist this value somewhere on the page and pass it back to the database when saving the record. indd 19 12/18/08 9:05:35 AM Chapter 2: The Data Access Layer retrieved. You could also use the TimeStamp type field in SQL Server to keep track of versions that SQL Server manages itself, but you are still responsible for checking when updating the record.
The BLL removes the complexity of the database from the UI developer and presents data in a more business-modeled fashion. It also serves to protect the integrity of the data that it passes to the data layer. NET website or Windows Forms application is using it — it will act the same way. Separating rules into the business layer and removing them from the UI avoids duplicate code. indd 12 12/18/08 9:05:34 AM Chapter 2: The Data Access Layer Rapid application development (RAD) tools typically have business rules wrapped in a particular screen.
ASP.NET 3.5 enterprise application development with Visual studio 2008: problem, design, solution by Vincent Varallo