asp net entity framework tutorial

MERs table. 1.Add MERsRecord Using (northwindentities mydb = new northwindentities ()) { Customers customer = new customers (); Random Rm = new random (); Customer. customerid = "A" + RM. Next (9999). tostring (); Customer. companyName = "entlib.com Forum "; Customer. Address = "http://www.EntLib.com "; Mydb. addtocustomers (customer ); Int COUNT = mydb. savechanges (); Txtcustomerid. Text = Customer. customerid; } 2.Update MERsRecord Using (northwindentities mydb = new northwindentities ())

Some time ago there were many Article This article introduces and analyzes LINQ to SQL. It can be said that it is a simple implementation of ORM, which is a problem that Microsoft has unbalanced impedance between data and objects. C #3.0 introduces some new features, such as extension method, Lambda expression, and anonymous type. In fact, these new features are used to serve LINQ. Program In the past, I was freed from writing a large number of SQL query statements, values, and assignments. I

The DATABASEFIRST:EF framework automatically generates data layers and model based on the database. Project--Add--New item--Data--ado.net Entity Data Model--build from database--New connection--Select server name, database--[Yes, include sensitive data in connection string]--Select datasheet, view in database, Stored procedure--complete--Overwrite web.config Using System; Using System.Collections.Generic;

More information: http://www.cnblogs.com/dingfangbo/p/5771741.htmlLearning ASP. NET MVC also has a period of time, intends to get a small program to practice practiced hand, as the learning process of recording and sharing.First of all, need to determine demand, wood needs, it also make a yarn! Well...... Think about it a little bit.Ok! In this way, start from the simple (in fact, the complex will not do),

file as an embedded file, this provides better security. In addition, this file and the object class file should be placed under the same directory. Finally, let's look at how to use such entity classes in the project: The object class of the custom query is similar to the ordinary PDF.. Net object classes are used in a similar way. They all require oql expressions for operations. For example,

After continuing with an initial summary of the development of ASP. NET VNext (using Visual Studio CTP1),About cloud optimization and version control:I wanted to do the self-host test for Mac and Linux, but the official said that the mono version of the operating environment required at least 3.4.1, I bought a watch last year, until the publication of this article, you let me go to Hell to find 3.4.1, with

5. Filter overrides You can get Themore details from Microsoft msdnhttp://www.asp.net/visual-studio/ OVERVIEW/2013/RELEASE-NOTES#TOC10 Layout support: Supports only Master Page in MVC2. Supports notonlymaster page but also Layout page in MVC 3 and MVC4. Validation: Client-side Validation and asynchronous controllers are there in MVC2. Unobtrusive Ajax and Client side Validation, Jquery Validation and JSON binding support are in MVC3. Client side validation, Jquery validation an

ASP. NET converts form elements into Entity objects or collections. asp. netform Introduction: WEBFROM developers know that it is very troublesome to receive parameters in the background. Although the form in MVC can be directly converted into a set, the form conversion to a LIST Usage of a single object: Form: Copy c

Before reading this article, you can go to the Asp. Net Web API 2 series navigation to view the sample code http://pan.baidu.com/s/1o6lqXN8 Most datasets define the relationship between entities: customers have orders, books have authors, and products have suppliers. The client can use OData to operate relations between entities. Given a product, you can find its suppliers. You can also create or delete a l

ADO. NET Entity Framework is the official ORM solution of Microsoft. Therefore, we can't help but remember the famous ORM solution in. NET Program Design-nhib.pdf from the open source. With the impressive appearance of VS2010, how will the new ADO. NET

method pairs, and now We do not need to implement classes that inherit from Asynccontroller alone, and you can create an asynchronous controller simply by adding a specific keyword and return type to the original action method. Also, in entity Framework6, the asynchronous querying and saving of data is implemented, which allows us to process logic asynchronously in the application process.Let's Do itExample using VS2013 to create an

Some time ago, many articles in the garden introduced the analysis of LINQ to SQL. It can be said that it is a simple implementation of ORM, And it is Microsoft's problem of unbalanced impedance between data and objects. C #3.0 introduces some new features, such as extension method, Lambda expression, and anonymous type. In fact, these new features are used to serve LINQ. By writing a large number of SQL query statements, values, and assignments in the past, the developer has made a lot of work

Improve response times and handle more users with parallel processingBuilding a Web application using non blocking calls to the data layer is a great it to increase the scalability of your s Ystem. Performing a task asynchronously frees up the worker thread to accept another request and work are being done Ground. Until recently, designing your system this is significantly more complicated. With the. NET Framework