ASP.NET 4.0 and the Entity Framework 4 - Part 2: Perform CRUD Operations Using the Entity Framework 4
page 1 of 8
Published: 30 Mar 2010
Abstract
In this article, Vince demonstrates the usage of the Entity Framework 4 to create, read, update, and delete records in the database which was created in Part 1 of this series. After a short introduction, he discusses the various step involved in the modification of the database, creation of a web form, the selection records to load a drop down list, and the adding, updating, deletion and retrieval of records from the database with the help of relevant source code and screen shots.
by Vince Varallo
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Introduction

This article will demonstrate how to use the Entity Framework 4 to create, read, update, and delete (CRUD) records from a SQL Server database.  This article builds upon the database that was generated in the first article, Create a Database Using Model First Development.  You'll need to download Visual Studio 2010 Beta 2 from Microsoft's site in order for the sample code to work.  You can download the sample code and database script here (code) (script).

The goal of this article is to create a web page that allows a user to maintain the records in the UserAccounts table.  The final web page looks like the following figure.

Figure 1

The drop down list at the top of the page allows you to navigate from user to user and display's the properties on the page.  The user can simply click the Save button to add or update records or click the Delete button to remove a record.


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User Comments

Title: oussama   
Name: skksll
Date: 2012-11-26 9:58:51 AM
Comment:
great
Title: Very Good Article   
Name: cafeasp
Date: 2012-06-25 11:07:38 AM
Comment:
I just try the 'Update' code and it works perfect!

Thanks for sharing this info.
Title: Help there are erros in executing the sql file   
Name: Silver
Date: 2012-01-27 12:42:52 AM
Comment:
Msg 911, Level 16, State 1, Line 1
Database 'OrderSystem' does not exist. Make sure that the name is entered correctly.
Msg 262, Level 14, State 1, Line 17
CREATE TABLE permission denied in database 'master'.
Msg 262, Level 14, State 1, Line 3
CREATE TABLE permission denied in database 'master'.
Msg 4902, Level 16, State 1, Line 7
Cannot find the object "dbo.UserAccounts" because it does not exist or you do not have permissions.
Msg 4902, Level 16, State 1, Line 3
Cannot find the object "dbo.Addresses" because it does not exist or you do not have permissions.
Msg 4902, Level 16, State 1, Line 7
Cannot find the object "dbo.Addresses" because it does not exist or you do not have permissions.
Title: images   
Name: k k h
Date: 2011-12-09 2:25:39 PM
Comment:
Images are broken.
Title: CRUD operation   
Name: Suvashis
Date: 2011-04-07 6:45:55 AM
Comment:
Lots of thanks for the EF 4.0 CRUD Operation understanding
Title: You are the man   
Name: LukTar
Date: 2011-02-07 5:19:08 PM
Comment:
Big respect for YOU. Great article which helped me a lot.
Title: Great Work   
Name: Mayank
Date: 2010-10-29 4:26:15 AM
Comment:
It very helpful article to understand the initial CRUD operations using Entity Framework 4

Thanks a lot
Title: trusted   
Name: david zing
Date: 2010-07-05 7:35:59 PM
Comment:
ent:
I can´t use the lines the code below to update the entity:

db.UserAccounts.Attach(userAccount);
db.ObjectStateManager.ChangeObjectState(userAccount, System.Data.EntityState.Modified);

on the first line I get the message: Attach is not a member of System.Data.Objects.ObjectQuery(Of...)

What´s wrong ?
Title: Mr   
Name: David Zing
Date: 2010-06-09 6:52:52 AM
Comment:
I can´t use the lines the code below to update the entity:

db.UserAccounts.Attach(userAccount);
db.ObjectStateManager.ChangeObjectState(userAccount, System.Data.EntityState.Modified);

on the first line I get the message: Attach is not a member of System.Data.Objects.ObjectQuery(Of...)

What´s wrong ?
Title: N-Tier?   
Name: V. Jenks
Date: 2010-05-10 10:43:30 AM
Comment:
I'd love to see an article this straightforward and approachable in an n-tier tutorial? The EF seems very simple until you try and separate concerns. What if I'd like to store all of my business logic and data access in a separate class library project?
Title: Very good intro   
Name: Marshall
Date: 2010-05-05 2:23:05 PM
Comment:
Great intro to EF and made very simple to understand.
Title: Thanks   
Name: Soyka
Date: 2010-05-05 1:30:11 AM
Comment:
I'm coding just for fun and sometimes I don't know where to start with a new thing. Your articles put me on the right track...Thanks
Title: Far Too Good   
Name: Sreedevi
Date: 2010-03-31 7:14:48 AM
Comment:
This is a very nice article. Its seems like a cake walk creating applications using VS2010. Hope we get to work on VS 2010 very soon.

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