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Code for rowupdating in gridview

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 some that includes both business logic and data-access logic.

In the database diagram, right-click the table, and select Relationships.

In the Foreign Key Relationships box click Add, then click the ellipsis for Tables and Columns Specification.

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This tutorial series builds on the Contoso University web application that is created by the Getting Started with the Entity Framework 4.0 tutorial series.

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.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.NET Web Forms applications using the Entity Framework 4.0 and Visual Studio 2010.In the Tables and Columns dialog box, set the primary key table and field to table if that person is a department administrator.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.The business logic class includes both business-logic methods and data-access methods, but the data-access methods call the repository to perform data-access tasks.You will also create an abstraction layer between your BLL and DAL that facilitates automated unit testing of the BLL.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.You will begin this tutorial by making two changes to the database, both of which require corresponding changes to the data model that you created in the Getting Started with the Entity Framework and Web Forms tutorials.

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  1. It explains how to perform Insert, update and delete operations in Gridview with Entity Framework database first approach.

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