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The Entity Framework uses an optimistic concurrency model by default. Optimism in this case means that we cross our fingers and hope that we don t get a data race between clients using the same database. You can learn more about data races in 24. The essence for this chapter is that two client programs read the same data from the database at roughly the same time. The first client makes a change to the data and updates the database. A moment later, the second client makes a different change to the same data and performs an update. When the second update is applied, the original set of changes are lost. You can enable concurrency checking on individual fields in the data model. This is still optimistic concurrency because no data is locked in the database, but it does mean that you will know when someone else has made changes to data that you intend to modify. In the section, I ll demonstrate how to apply concurrency checking to a single field, the LastName property in the Employee entity object. Open the data model diagram by double-clicking the NorthwindModel.edmx entry in the Solution Explorer window. Scroll down until you see the Employee diagram, right-click the LastName property, and select Properties. Find the Concurrency Mode property, and change the setting to Fixed, as illustrated by Figure 30-23.

Select Save from the File menu to save the change to the data model. This has enabled concurrency checking for one field. If you want this feature enable for fields, you must repeat these steps for each and every one. There is no facility for changing all of the fields in one go. If we try to update the LastName field when someone else has modified since we read it from the database, the Entity Framework will throw an OptimisticConcurrencyException when we call the SaveChanges method. We can catch this method and prevent overwriting changes made by others.

Summary

CHAPTER 6 EXTENSIBLE MARKUP LANGUAGE (XML)

Summary

In this chapter, we saw now the Entity Framework can be used to create a data model that lets us work with a database using C# data types and LINQ queries. Features such as navigation properties make working with the data much more like working with regular C# objects, and we don t need to break out the SQL at any point. The Entity Framework can be used to create incredibly complex and sophisticated data models, and we have only scratched the surface with the model we used in this chapter, but even so, you can see how object-relational mapping can be performing using the Entity Framework and how LINQ to Entities can be used in place of SQL to query the underlying data.

The last of our chapters on LINQ relates to the System.Data.DataSet class, which can be used to create an in-memory cache of data from a database and which can be used as the data source for LINQ queries. The DataSet class is part of ADO.NET just like the Entity Framework that we saw in the previous chapter. ADO.NET is big; it allows you to access a wide range of data sources in a wide range of ways. In this chapter, we ll be looking at working with databases more directly than with the Entity Framework. We won t be using data models or C# objects that represent tables and rows. In fact, if you have been waiting for a chance to break out your SQL skills, then this is the chapter for you. ADO.NET supports all the major databases and quite a few of the minor ones. We won t be going into the details of setting up and configuring a database, and our examples will all be based on SQL Server Express. That said, everything you learn in this chapter can be transferred to other database servers because of the way that ADO.NET provides consistent access to data and databases. Table 31-1 provides the summary for this chapter. Table 31-1. Quick Problem/Solution Reference for 31

Connect to a database. Store connection strings outside of code files. Execute a SQL query. Creating an in-memory result cache. Use LINQ to query a DataSet.