Validating collection properties

In this recipe, we will learn to define restrictions on the number of related objects that are defined.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework 4.1 assemblies.

The package installer can be found at http://nuget.org.

We will also be using a database for connecting to the data and updating it.

Open the Improving Collection Property Validation solution in the included source code examples.

How to do it...

Let's get connected to the database using the following steps:

  1. We start by adding a new unit test named ValidationTests to the test project. We make a test that connects to the database and adds an object. This will test whether the configuration and our validation code are ...

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