Gridview rowupdating newvalues example

15-May-2020 14:29 by 8 Comments

Gridview rowupdating newvalues example

Like the Getting Started series, this tutorial series uses the ASP. This lets you combine the advantages of an n-tier approach with the benefits of using a Web Forms control for data access.

The Contoso University sample web application demonstrates how to create ASP.

In the third tutorial in this series you will add sorting and filtering functionality to the application.

The pages you create in this tutorial work with the entity set of the data model that you created in the Getting Started tutorial series.

Because you write your own data-access code, it's easier to do more than just read, insert, update, or delete a specific entity type, which are the tasks that the control is designed to perform.

For example, you can perform logging every time an entity is updated, archive data whenever an entity is deleted, or automatically check and update related data as needed when inserting a row with a foreign key value. For example, when you update a department, you might need to validate that no other departments have the same administrator because one person cannot be administrator of more than one department.

In a production application, you would provide a specific error message when a database constraint prevents a deletion, or you would specify a cascading delete.

For an example of how to specify a cascading delete, see The Entity Framework and ASP. page that you will be creating, you want to provide a drop-down list of instructors, with names in "last, first" format so that users can select department administrators.To make it easier to do that, you will create a view in the database.The view will consist of just the data needed by the drop-down list: the full name (properly formatted) and the record key.It includes functionality such as student admission, course creation, and instructor assignments. The downloadable sample contains code in both C# and Visual Basic. NET MVC framework, see Getting Started with the Entity Framework using ASP. application structure that's more maintainable. To implement this architecture, you separate the presentation layer from the business logic layer (BLL) and the data access layer (DAL).There are three ways you can work with data in the Entity Framework: . For information about the differences between these workflows and guidance on how to choose the best one for your scenario, see Entity Framework Development Workflows. One way to implement this structure is to use the pages using a control that has many of the same features as other data-source controls.In some that includes both business logic and data-access logic.