![]() Once you have organised a copy of the database, you are ready to start the EF wizard. If you cannot find a copy of Northwind.sdf on your system, download this sample from one of my previous articles and borrow the copy from the App_Data folder there. (x86) will only feature in the file path on 64 bit operating systems, so if you are working with 32 bits, leave that part out. This is typically C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v4.0\Samples. Navigate to the location of Northwind.sdf. ![]() Right click on the App_Data folder in Solution Explorer and choose Add Existing Item. If you remove the database file, you must also comment out or delete the first line in _AppStart.cshtml You can remove the Account folder if you like, as well as the StarterSite.mdf file in App_Data This generates a site based on the Starter Site template. Once you have started VWD, choose New Web Site, and then select ASP.NET Web Site (Razor) from the options available If you download VWD, you automatically get SP1 anyway. If you already have VWD installed, you must make sure that you also have Service Pack 1 as this contains the tooling for generating Razor Web Pages sites. So, that leaves VWD as the remaining free option. It is not available in WebMatrix 1.0 and there are no indications at the moment that it will be added to WebMatrix in version 2.0 - the Beta of which is available now. The EF wizard comes as a standard part of both Visual Studio 2010 and Visual Web Developer Express 2010 (VWD). However, this article looks at the wizard and design tools that are freely available for this task instead. It is possible to generate the various files that EF needs by using a command line tool - edmgen.exe. In this article, EF will generate class definitions and mappings based purely on the schema of an existing database. In the previous article, EF generated a database, including all tables, relationships etc, based purely on the defintion of some C# classes. It is also a code and database generation tool. EF's role is to map entities to database schema (tables, views etc) and to allow the developer to stick to C# alone - letting EF take care of transitioning C# Linq expressions to SQL to be executed against the database. ![]() On the other hand, the developer will use another language (SQL) to persist entities to a data store (the database), or to retrieve them from persistent storage. ![]() On the one hand, a developer will work with their entities, such as Products or Employees using C# to instantiate them, bind them to grids, change them and so on. Entity Framework (EF) is a technology that attempts to alleviate the friction caused when developers have to move between the conceptual representation of their application (the entities that represent the application's domain) and the logical or relational representation of the data (typically the database itself). ![]()
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