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You can write LINQ queries against any objects that support IEnumerable. These include most collection classes in the .NET Framework. A LINQ query only executes when it is acted upon, as when For Each is used or ToList is called. There are several specialized providers that allow LINQ to work with specific data sources. These include LINQ to SQL, LINQ to DataSet, LINQ to Entities, and LINQ to XML. The use of standard LINQ to work with collection classes is referred to as LINQ to Objects. LINQ queries are written with the LINQ language extension, which includes keywords such as From, Select, Where, Group By, Join, Order By, Into, Concat, and others. You can use LINQ to transform data from one format into another. This allows you to create new types, new anonymous types, XML files, and even JSON-formatted output.

You can use the following questions to test your knowledge of the information in Lesson 1, Getting Started with LINQ. The questions are also available on the companion CD in a practice test, if you prefer to review them in electronic form.

1. Click Start, point to Administrative Tools, and click Routing And Remote Access. 2. Right-click VPN1, point to All Tasks, and click Stop. 3. Wait for the Routing And Remote Access service to stop.

Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.

<script language="C#" runat=server> void Validate_Click(Object sender, EventArgs E) { if ( Page.IsValid ) { Msg.Text="Page Valid"; } } void CustomServerVal (object source, ServerValidateEventArgs args) {

1. 2.

Against which of the following classes can you write a LINQ query (Choose all that apply).

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4. When the service has stopped, right-click VPN1, point to All Tasks, and click Start. This step ensures both that the remote access policies have been refreshed from DC1 and that the RAS and IAS Servers certificate on VPN1 (auto-enrolled through Group Policy after Routing And Remote Access was already started) will be accessible.

A. DataSet B. List<T> c. Array D. Dictionary<TKey, TValue)

You need to write a LINQ query to retrieve a list of state hospitals. The results should be sorted and grouped first by county. For each county, the hospitals should be sorted by city. Which of the following LINQ queries would you write (Choose all that apply.)

try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } catch { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } </script>

1. Click Start, point to Administrative Tools, and click Connection Manager Administration Kit. 2. On the Welcome To The Connection Manager Administration Kit Wizard page, click Next. 3. On the Service Profile Selection page, ensure that New Profile is selected, and then click Next. 4. On the Service And File Names page, type VPN Access to Example.com in the Service Name text box and type Example in the File Name text box (as shown in Figure 7-26), and then click Next.

Dim hsQ = From hspt In hospitals Order By hspt.County, hspt.City Group hspt By hspt.County Into hsptGroup = Group

var hsQ = from hspt in hospitals orderby hspt.County, hspt.City group hspt by hspt.County;

Dim hsQ = From hspt In hospitals Order By hspt.County Group hspt By hspt.County Into hsptGroup = Group Order By hsptGroup.Last.City

5. On the Realm Name page, click Next. 6. On the Merging Profile Information page, click Next. 7. On the VPN Support page, select the Phone Book From This Profile check box. In VPN Server Name Or IP Address, click Always Use The Same VPN Server, type 10.0.0.2 (as shown in Figure 7-27), and click Next.

var hsQ = from hspt in hospitals orderby hspt.County group hspt by hspt.County into hsptGroup orderby hsptGroup.Last().City select hsptGroup;

<body> <form runat=server> <center> <h3> <font face="Verdana" color=blue> Validator Test Page Summary </font> </h3> <table>

Dim hsQ = From hspt In hospitals Order By hspt.County, hspt.City Group hspt By hspt.County Into hsptGroup = Group Order By hsptGroup.First.County

7

var hsQ = from hspt in hospitals orderby hspt.County group hspt by hspt.County into hsptGroup orderby hsptGroup.Key select hsptGroup;

Dim hsQ = From hspt In hospitals Order By hspt.City Group hspt By hspt.County Into hsptGroup = Group Order By hsptGroup.First.County

8. On the VPN Entries page, select the default entry and click Edit. 9. Click the Security tab. In the Security Settings drop-down list, click Use Advanced Security Settings (as shown in the following figure), and then click Configure.