Copyright © Intertech, Inc. 2006. All Rights Reserved.

• Understand the scope of .NET 3.0 / .NET 3.5
• Introduce LINQ & Core Language Changes
• Introduce Windows Presentation Foundation (WPF)
• Introduce Windows Communication Foundation
(WCF)
• Introduce Windows Workflow Foundation (WF)
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• .NET 3.0 is an augmentative release of the .NET base class
libraries:
• Everything you currently know about .NET 1.0 / 1.1 / 2.0 still applies
100%.
• .NET 3.0 did not change the C# or VB languages:
• You can build .NET 3.0 projects using C#/VB 2005 or C#/VB 2008.
• You can build .NET 3.0 projects using VS 2005 or VS 2008.
• If you use VS 2005, you will need to download (free) .NET 3.0
project templates.
• Consult www.microsoft.com/downloads.
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• Essentially, .NET 3.0 is nothing more than three new APIs:
• Windows Presentation Foundation (WPF).
• Windows Communication Foundation (WCF).
• Windows Workflow Foundation (WF).
• .NET 3.0 is not only for Vista development:
• Windows XP and Windows Server 2003 can be used to develop and
execute .NET 3.0 software with no problems.
• However, .NET 3.0 software can perform ‘better’ on Vista given the
new driver model (etc.).
• .NET 3.0 is natively part of Vista.
• XP / Windows Server requires installation of the .NET 3.0 SDK / .NET
3.0 runtime.
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• Unlike .NET 3.0, .NET 3.5 introduces dozens of new
language updates.
• C# and VB have both been enhanced with new features.
• Many of these new features are here to support LINQ.
• Language Integrated Query (LINQ) is perhaps the
biggest feature of .NET 3.5.
• LINQ is a new query language used to access a variety of data
stores.
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• Beyond new language features / LINQ, .NET 3.5
provides:
• A handful of new namespaces (ex: support for named pipes).
• The WF API has new activities for WCF communications.
• AJAX support has been integrated into the base class libraries.
• VS 2008 has also received a few welcomed changes:
• New streamlined ASP.NET web page designer.
• WPF, WCF, WF, LINQ project integration.
• Ability to pick between .NET 2.0, 3.0, 3.5 projects!
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• To begin our chat, we will survey some (but not all) of
the .NET 3.5 language changes.
• Implicit typing of local variables.
• Use of extension methods.
• The role of anonymous types.
• Object initialization syntax.
• Lambda expressions.
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• Implicitly typed local variables.
• Compiler infers the underlying data type, based on initial assignment.
• NOT a Variant! NOT script code! IS Strongly typed!
• Greatly simplifies working with LINQ query expressions.
// C#
static void ImplicitLocalVars()
{
// Implicitly typed local variables.
var myInt = 0;
var myBool = true;
var myString = \"Time, marches on...\";
}
' VB
Sub ImplicitLocalVars()
' Implicitly typed local variables.
' Notice the lack of an As clause.
Dim myInt = 0
Dim myBool = True
Dim myString = \"Time, marches on...\"
End Sub
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• Implicitly typed local variables can also be used in foreach
loops.
• Compiler will ensure correct underlying type.
// C#
static void ImplicitVarInForEach()
{
// Array of System.Int32 types.
var evenNumbers = new int[] { 2, 4, 6, 8 };
// Here, item is a System.Int32.
foreach (var item in evenNumbers)
{
Console.WriteLine(\"Item value: {0}\", item);
}
}
' VB
Sub ImplicitVarInForEach()
' Array of System.Int32 types.
Dim myIntArray = New Integer() { 2, 4, 6, 8 }
' Here, item is a System.Int32.
For Each item In myIntArray
Console.WriteLine(\"Item value: {0}\", item)
Next
End Sub
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• Extension methods allow you to add new functionality to a
pre-compiled type.
• Allows for easy augmentation of types for which you do not have
source code.
• Allows you to inject a polymorphic interface into existing code.
• Extension methods do not serve the same purpose as
inheritance.
• Inheritance implies generating a brand new type based on existing
types.
• Extension methods update the ‘same’ type with new functionality.
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// C#
using System.Reflection;
static class MyExtensions
{
// This method allows any object to display the assembly
// it is defined in.
public static void DisplayDefiningAssembly(this object obj)
{
Console.WriteLine(\"{0} lives here: {1}\", obj.GetType().Name,
Assembly.GetAssembly(obj.GetType()));
}
}
' VB
Imports System.Runtime.CompilerServices
Imports System.Reflection
Public Module MyExtensions
<Extension()> _
Sub DisplayDefiningAssembly(ByVal obj As Object)
Console.WriteLine(\"{0} lives here: {1}\", obj.GetType().Name, _
Assembly.GetAssembly(obj.GetType()))
End Sub
End Module
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// C# (VB code would be similar)
static void Main(string[] args)
{
Console.WriteLine(\"***** Fun with Extension Methods *****\\n\");
// The int has assumed a new identity!
int myInt = 12345678;
myInt.DisplayDefiningAssembly();
// So has the DataSet!
System.Data.DataSet ds = new System.Data.DataSet();
ds.DisplayDefiningAssembly();
// And the SoundPlayer!
System.Media.SoundPlayer sp = new System.Media.SoundPlayer();
sp.DisplayDefiningAssembly();
}
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• Object initialization syntax allows you to set property values
(or public field values) at the time of creation.
• Can also call custom constructors.
• Assume a Rectangle class which defines two properties
(TopLeft, BottomRight) that each get / set a Point type.
• The Point type has two properties (X, Y).
• Thus, Rectangle ‘has’ two Points.
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// C#
Rectangle myRect = new Rectangle
{
TopLeft = new Point { X = 10, Y = 10 },
BottomRight = new Point { X = 200, Y = 200}
};
' VB
Dim myRect As New Rectangle With { _
.TopLeft = New Point With {.X = 10, .Y = 10}, _
.BottomRight = New Point With {.X = 200, .Y = 200}}
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 14

// C#
// Init a List<T> of Rectangles.
List<Rectangle> myListOfRects = new List<Rectangle>
{
new Rectangle {TopLeft = new Point { X = 10, Y = 10 },
BottomRight = new Point { X = 200, Y = 200}},
new Rectangle {TopLeft = new Point { X = 2, Y = 2 },
BottomRight = new Point { X = 100, Y = 100}},
new Rectangle {TopLeft = new Point { X = 5, Y = 5 },
BottomRight = new Point { X = 90, Y = 75}}
};
' VB does not support collection init syntax.
Sub Main()
' Make container first.
Dim myListOfRectangles As New List(Of Rectangle)
' Add items via Add() method.
myListOfRectangles.Add(New Rectangle With { _
.TopLeft = New Point With {.X = 10, .Y = 10}, _
.BottomRight = New Point With {.X = 200, .Y = 200}})
End Sub
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 15

• Anonymous types allow you to model the ‘shape’ of
data without concern for it’s functionality.
• Very helpful for LINQ queries.
• Compiler generates a full blown class type in the background.
• Anonymous types always:
• Are constructed with the default constructor.
• Extend System.Object (with value-based overrides).
• Map name/value pairs into properties with backing fields.
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// C#
static void CreateAndUseAnonymousType()
{
// Make an anonymous type representing a car.
var myCar =
new { Color = \"Black\", Make = \"Saab\", CurrentSpeed = 55 };
Console.WriteLine(\"My car is the color {0}.\", myCar.Color);
}
' VB
Sub CreateAndUseAnonymousType()
' Make an anonymous type representing a car.
Dim myCar = New With {.Color = \"Black\", .Make = \"Saab\", .CurrentSpeed = 55}
Console.WriteLine(\"My car is the color {0}.\", myCar.Color)
End Sub
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 17

// C#
static void CreateAndUseAnonymousType()
{
// C# underlying properties are read only!
var myCar = new { Color = \"Black\", Make = \"Saab\", CurrentSpeed = 55 };
myCar.Color = \"Pink\"; // ERROR in C#!
Console.WriteLine(\"My car is the color {0}.\", myCar.Color);
}
' VB
Sub CreateAndUseAnonymousType()
' VB underlying properties are read/write!
Dim myCar = New With {.Color = \"Black\", .Make = \"Saab\", .CurrentSpeed = 55}
myCar.Color = \"Pink\" ' OK in VB!
' Color would now be \"Pink\"
Console.WriteLine(\"My car is the color {0}.\", myCar.Color)
End Sub
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• The final language feature to consider is that of
lambda Expression syntax.
• Simplifies how we work with .NET delegate types.
• Demo!
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• LINQ (Language Integrated Query) allows .NET languages to
create strongly typed query expressions.
• Full support for object representation.
• Compiler checked, IntelliSense support, debugging support, etc.
• LINQ queries are created using any number of ‘query
operators’ or related method calls in the object model.
• Modeled after SQL queries.
• The twist is that a LINQ query expression can be executed
against:
• Relational databases.
• XML documents
• Any object implementing IEnumerable<T>.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 20

• LINQ offers a unified solution to the problem of
obtaining and manipulating ‘data’.
• Under .NET 2.0, we were forced to learn unique APIs to gain
access to various forms of data.
• ADO.NET, XML namespaces, collection methods, etc.
• Using LINQ, we can apply the same operators /
statements to a wide variety of data stores.
• Relational data, containers and XML docs.
• Third parts can extend LINQ (via extension methods) to query
over other data stores.
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• The LINQ API is represented by three major assemblies, each
of which has a number of namespaces and types.
• System.Core.dll: this is the core LINQ assembly which defines types
needed for any LINQ aware-application.
• System.Data.Linq.dll: defines LINQ to SQL data types. This is
required when using LINQ to access relational database.
• System.Xml.Linq.dll: defines LINQ to XML data types, required when
using LINQ to manipulate XML documents.
• In addition, other assemblies are used to define
extension methods for other types.
• System.Data.DataSetExtensions.dll (for example) adds
LINQ-awareness to the DataSet type.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 22

// C# ' VB
static void QueryOverArray() Sub QueryOverArray()
{ Dim currentVideoGames As String() = {\"Morrowind\", \"Dead Rising\", _
string[] currentVideoGames = {\"Morrowind\", \"Dead Rising\", \"Half Life 2: Episode 1\", \"F.E.A.R.\", _
\"Half Life 2: Episode 1\", \"F.E.A.R.\", \"Daxter\", \"System Shock 2\"}
\"Daxter\", \"System Shock 2\"};
' Build a query expression to find the items in the array
// Build a query expression to find the strings in the array ' which have more than 6 letters.
Dim subset = From g In currentVideoGames _
// which have more than 6 letters.
Where g.Length > 6 Order By g Select g
var subset = from g in currentVideoGames
where g.Length > 6 orderby g select g;
'Print out the results (notice no ‘Daxter’)
For Each s As String In subset
// Print out the results (notice no ‘Daxter’) Console.WriteLine(\"Item: {0}\", s)
foreach (string s in subset) Next
Console.WriteLine(\"Item: {0}\", s); End Sub
}
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• Consider the following additional example:
static void Main(string[] args)
{
// Get metadata descriptions for all types in mscorlib.
Assembly corlib = Assembly.Load(\"mscorlib\");
Type[] typeInfo = corlib.GetTypes();
// Only get the public enums.
// VB: Dim enumTypes = From e in typeInfo Where _
// e.IsEnum = True And e.IsPublic Select e
var enumTypes = from e in typeInfo where
e.IsEnum == true && e.IsPublic select e;
Console.WriteLine(\"***** Here are all the enums in mscorlib.dll *****\\n\");
foreach (var e in enumTypes)
Console.WriteLine(\"Name: {0}\", e.ToString());
}
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• A LINQ query is not literally executed until you query over the
results.
• This differed execution allows you to change the contents of a
container and obtain new results.
// C#
static void QueryOverArrayOfInts()
{
int[] numbers = { 10, 20, 30, 40, 1, 2, 3, 8 };
// Get numbers less than ten.
var subset = from i in numbers where i < 10 select i;
// LINQ statement evaluated here!
foreach (var i in subset)
Console.WriteLine(\"{0} < 10\", i);
Console.WriteLine();
// Change some data in the array.
numbers[0] = 4;
// Evaluate again.
foreach (var j in subset)
Console.WriteLine(\"{0} < 10\", j);
}
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• LINQ To ADO.NET
• LINQ To XML
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• The Windows Forms API is a well know model for building
desktop apps with the .NET platform.
• However, building a complex WinForms application demands
mastering several diverse and asymmetrical APIs.
Application Requirement .NET 2.0 Solution
Core Form / Control model Windows Forms
2D Graphics GDI+ (System.Drawing.dll)
3D Graphics DirectX APIs
Live Video Feeds Windows Media Player APIs
Fixed Style Documents Programmatic manipulation of PDF files.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 27

• One of the major goals with WPF is to provide a
single, symmetrical model for desktop development.
• With WPF, all necessary technologies are baked into the same
assemblies (much easer!).
Application Requirement .NET 3.0 Solution
Core Form / Control model Windows Presentation Foundation
2D Graphics Windows Presentation Foundation
3D Graphics Windows Presentation Foundation
Live Video Feeds Windows Presentation Foundation
Fixed Style Documents (PDFs) Windows Presentation Foundation
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• Another major difference between WinForms and WPF is
support for a separation of concerns via XAML.
• XAML is essentially, desktop markup.
• WPF apps allow you to separate the look and feel of your apps from
the logic which drives it.
• Use of XAML however, is entirely optional.
• If you wish, you can take the 100% pure code approach.
• You could take a 100% pure XAML approach.
• Or (most commonly) take a code file approach (XAML / Code split).
• When taking the code file approach, you will find the process
of building a WPF app is eerily similar to building an ASP.NET
web app.
• Partial classes, markup + code, XAML to code mappings, etc.
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• The major motivation for XAML is the separation of
concerns.
• Programmers can use dev tools (VS 2008) to write .NET code.
• Graphical minded individuals can using design tools
(Expression Blend) to build a rich UI interface.
• The XAML files can then be passed to us and integrated into
our projects.
• More information on MS Expression products:
• Quick Blend Demo…
• www.microsoft.com/products/expression
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 30

• In addition to the benefits already mentioned, WPF
offers a number of additional bells and whistles:
• The ability to host a WPF application within a web browser (via
XAML browser applications…XBAP).
• Numerous layout managers to position controls.
• A new (very slick) data binding engine.
• Support for styles and templates, to ‘skin’ your WPF apps.
• WPF relies entirely on vector graphics, allowing an image to be
automatically resized to fit the size and resolution of the screen
it's displayed on.
• Integrated animation / 3D-rendering services.
• Support for interop-ing with legacy UI models (Windows Forms,
ActiveX, etc).
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• WPF Demo!
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• Windows Communication Foundation (WCF)
integrates numerous distributed technologies.
• Similar to WPF, WCF lives to provide symmetry.
• Today building a distributed app is complex at best.
• Too many diverse APIs (COM+, MSMQ, web services,
remoting).
• Each has a different object model, configuration tools,
documentation, etc.
• The current approach is complex, confusing and hard to
maintain.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 33

• WCF provides a single, extendable object model.
• Using *.config files, you can radically change the underlying plumbing
via markup (channels, transports, etc).
• SvcConfigEditor.exe can build client-side and server-side *.config files.
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• Support for strongly typed as well as untyped messages.
• This approach allows .NET applications to share custom types simply
and efficiently.
• Software created using other platforms (such as Java) can consume
streams of loosely typed XML.
• Support for several endpoints to allow you to choose the most
appropriate plumbing to transport data to and fro.
• HTTP, HTTP + SOAP
• MSMQ
• Named Pipes
• TCP
• COM+
• Any custom endpoint you might dream up…
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• WCF applications are designed by specifying the A, B, Cs:
• Address: Where does this service life?
• Bindings: Which protocols are used to access it?
• Contracts: Once I get there, what will I find?
• The Service Configuration Tool can be used to specify the set
of bindings and address of a given service.
• The contract of a WCF service are defined in code.
• In many ways, these A, B, Cs are a re-telling of WSDL
descriptors.
• In other ways, these A, B, Cs are a re-telling to the sort of data found
within a .NET remoting configuration file.
• The short answer is, if you have worked with XML web
services or .NET remoting…
• …you’ll feel right at home with WCF.
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• Building a WCF service is very simple:
• Numerous attributes can be used to control service behaviors.
• Functionality is (typically) exposed using strongly typed interfaces.
• The collection of WCF types is typically bundled into a .NET *.dll.
[ServiceContract]
public interface ICarOrder
{
// Allows caller to place and order and obtain
// an order ID.
[OperationContract]
int PlaceOrder(string make, string color, double price);
// Allows caller to get current status of the order.
[OperationContract]
string CheckOrderStatus(int orderID);
}
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• WCF Services can be hosted from a variety of locations.
• Any *.exe assembly.
• Within IIS
• From WAS (Vista-specific activation service).
• The ServiceHost type is used (directly or indirectly) to host the service
itself.
• Anything can be a consumer of WCF services:
• *.exe, *.dll, web page, WCF service, etc.
• .NET, COM, Java, C++, etc.
• Linux, Mac, XP, Vista, etc.
• Simply adjust the bindings to ensure the correct ‘reach’.
• Client side proxies can be generated with svcutil.exe or VS 2008.
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• WCF Demo!
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• Windows Workflow Foundation (WF) is perhaps the 'strangest'
element of .NET 3.0.
• Earlier versions of .NET have no direct equivalent.
• However, the idea of ‘workflow enabled applications’ is not new.
• Using WF, you are able to model directly in your assembly the
workflows used by your applications.
• Workflows = business processes.
• The WF runtime engine can then execute these tasks as your
application is running.
• The same model used to author code can be shared with other non-
technical staff.
• Thus, no need to maintain separate docs to illustrate to others what
your code is doing.
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• WF enabled applications consist of any number of
‘activities’.
• These activities are connected via decision / iteration paths.
• Paths can run in parallel.
• Primary located in System.Workflow.Activities.
As of .NET 3.5,
we are also provided
with new types to
interact with WCF services
(SendActivity,
ReceiveActivity).
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• Visual Studio has excellent support to model workflows and
configure activities.
• Much like building a UI application, you have a visual designer,
Toolbox and Properties window.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 42

• Beyond activities, designers and the WF runtime, the WF API
also provides a number of auxiliary services:
WF Service Meaning in Life
Persistence Services Allows you to save a WF instance to an external source (such as a
database). This can be useful if a long running business process will be
idle for some amount of time.
Transaction Services WF instances can be monitored in a transactional context, to ensure
that each aspect of your workflow completes (or fails) as a singular
atomic unit.
Tracking Services This feature is primary used for debugging and optimization of a WF
activity; it allows you to monitor the activities of a given workflow.
Scheduling Services This service allows you to control how the WF runtime engine manages
threads for your workflows.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 43

• Workflows can be baked directly into a executable assembly.
• However it is also possible pack WFs into a .NET *.dll.
• In this way, you achieve binary reuse of workflows.
• Regardless of how they are packaged, a WF is executed via
the WorkflowRuntime type.
• Pass in the type information of the WF you wish to execute.
static void Main(string[] args)
{
// Create the WF runtime.
using(WorkflowRuntime workflowRuntime = new WorkflowRuntime())
{
// Create an instance of the WF to execute and call Start().
WorkflowInstance instance =
workflowRuntime.CreateWorkflow(typeof(SimpleWFApp.Workflow1));
instance.Start();
}
// Other work…
}
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• WF Demo!
• Visual Studio 2008 WF designer tools.
• Examine select activities.
• Building a component driven WF application.
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• Intertech Training offers a full line up of .NET 3.x
courses:
• Delta .NET 3.0-3.5
• Complete LINQ
• Complete WPF
• Complete WCF
• Complete WF
• Each course assumes knowledge equivalent to:
• Complete C#
• Complete VB
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• .NET 3.0 is an augmentative release to the .NET
BCL.
• WPF: Integrated desktop / Smart Client API.
• WCF: Integrated communications API.
• WF: Allows for integration of ‘workflow enabled applications’.
• C# 2008 / VB 2008.
• C# / VB each support numerous language enhancements, used
to support LINQ technologies.
• LINQ provides a symmetrical manner in which to interact with
‘data’ in the broad sense of the term.
Copyright © Intertech, Inc. 2006 • www.Intertech.com • 800-866-9884 • Slide 47