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You saw in the previous section that querying data in LINQ uses some basic keywords such as From, Where, and Select. You use these keywords (along with others) to write LINQ queries against a data source. Of course, the first step is to actually define a data source against which you can query. Recall that this might be any object that implements the IEnumerable interface (or a derivative of that interface). After you have your data source, you then can define a strongly typed query against that data. The final step is to execute that query and return the results. The following sections focus on the core concepts of writing LINQ queries against a data source.

The LINQ language constructs can seem odd at first. They do not look like traditional .NET Framework code, and they do not quite follow standard SQL syntax. Be sure you know how to read LINQ for the exam.

To deploy on-demand site-to-site VPN connections to connect the Portland and Dallas branch offices to the corporate office based on the settings configured in the Common Configuration for the VPN Server section of this chapter, the following additional settings are configured.

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You must have a data source defined before you can write a query against it. LINQ can query nearly all collections of data in the .NET Framework. This means that your data source could be an XML document loaded into an object, an entity model defined with either the Entity Framework or a LINQ to SQL model, or simply an array of values. The following sections provide a few examples of defining different types of data sources and writing basic LINQ queries against them.

You can write LINQ queries against the .NET Framework arrays. The following example shows an array of strings. You can then see the LINQ query that is written against this array. Notice that the range variable (emp) used in the From clause gets automatically defined as a string because the array includes string values. You can iterate over the underlying collection defined by the LINQ query by using an iterative technique such as For Each.

This brief introduction is by no means complete. You can refer to the MSDN documentation for more information.

Sample of Visual Basic Code Dim employees As String() = {"Michael", "Hank", "Benjamin", "Gail"} Dim empQuery = From emp In employees Where emp.Length > 5 Select emp Sample of C# Code string[] employees = {"Michael", "Hank", "Benjamin", "Gail"}; var empQuery = from emp in employees where emp.Length > 5 select emp;

For the VPN connection to the Dallas office, the user account VPN_Dallas is created with the following settings:

You can use LINQ to query against data stored in a collection class, such as the List<T> class (among many others). The following code creates a new List<Employee> collection. The Employee class is simply a custom class that was written to hold a few properties. The code then defines a simple LINQ query against the class. You can then iterate over the collection defined by the query.

Sample of Visual Basic Code Dim employees As List(Of Employee) = New List(Of Employee) From {New Employee With {.First = "Michael", .ID = 111, .Department = "IT Department", .City = "Pittsburgh"}, New Employee With {.First = "Hank", .ID = 112, .Department = "IT Department", .City = "Redmond"}, New Employee With {.First = "Benjamin", .ID = 113, .Department = "Human Resources", .City = "Chicago"}, New Employee With {.First = "Gail", .ID = 113, .Department = "Marketing", .City = "Ann Arbor"} } Dim empQuery As IEnumerable(Of Employee) = From emp In employees Where emp.First.Length > 5 Select emp Sample of C# Code List<Employee> employees = new List<Employee>() { new Employee {First="Michael", ID=111, Department="IT Department", City="Pittsburgh"}, new Employee {First="Hank", ID=112, Department="IT Department", City="Redmond"}, new Employee {First="Benjamin", ID=113, Department="Human Resources", City="Chicago"}, new Employee {First="Gail", ID=114, Department="Marketing", City="Ann Arbor"}, }; IEnumerable<Employee> empQuery = from emp in employees where emp.First.Length > 5 select emp;

For the dial-in properties on the VPN_Dallas account, the remote access permission is set to Control Access Through Remote Access Policy and the static route 192.168.28.0 with a subnet mask of 255.255.255.0 is added.

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