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This articles describe one of the newest runtime features in ASP.NET 4.5. I will describe about Muticore Just-In-Compiler (JIT) in the .NET framework 4.5.

Multicore Just-in-Time (JIT) 

In the .NET framework 4.5, Microsoft has introduced an enhancement of the pervious JIT compiler by making it a Multicore JIT compiler, that runs on the two cores and supports parallelism in the compilation process in order to improve the launch performance during application startup.

From the developer point of view the Multicore JIT is a very cool runtime feature in .NET Framework 4.5 to improve their productivity and speed up the overall performance of an application. Now the developer can benefit from multicore processors to speed up the application compilation process.

The Multicore JIT compiler works in parallel with two cores. Because of the two cores, Multicore JIT can make your application start the process faster at startup. Multicore JIT provides significant improvements to Web based applications as well as Desktop Windows Presentation Foundation (WPF) applications.

Working of Multicore JIT

Nowadays, every PC has at least two cores, so the JIT compiler is built to make the investment worthwhile. Using the Multicore JIT, methods are compiled on two CPUs so that the application is able to reach the end of its startup execution quickly.

The compilation process is done in two cores that run in parallel executing the Multicore JIT compiler. The more effective Multicore JIT will reduce the startup time of an .NET application. 

Multicore JIT uses the two modes of operation.

Recording mode: It is the first mode, when JIT compiles the entire program and creates a JIT profile using a profile optimization class and saves the profile that was executed to a given folder to disk.

Playback mode: This mode is used when the application is launched subsequently. Playback mode is used to load the profile that was saved during the Recording mode from the disk using the background JIT thread in order to support the main thread.

The feature works by the JIT compiling the methods likely to be executed based on profiles created during previous compilations, that will runs on a separate processor core taking care of the JIT Compilation while the main execution thread runs on a different core.

In the ideal case, the second core quickly gets ahead of the mainline execution of the application, so whenever a method is required it is already compiled. As a result, the main thread doesn't need to do as much compilation, and your application launches faster.

In order to know which methods to compile, the feature generates profile data in the Recording mode that keeps track of the methods that are executed. Then the next time the application runs the call will look for that profile and when it finds it then it plays back; that means it starts compiling all the methods that was saved for that profile.

Note: MultiCore JIT requires a multicore machine to take advantage of its algorithms otherwise the CLR will ignore it on single core machines.

How to enable Multicore JIT in an .NET 4.5 application.

You can use this feature of the runtime to significantly improve the startup times of both client applications and Web sites in .NET framework 4.5.

Since ASP.NET applications run in a hosted environment, this feature is turned on for these applications automatically. Therefore JIT compiling using multiple cores is enabled by default in ASP.NET 4.5 and Silverlight 5.

But, if you want to disable this feature in your ASP.NET 4.5 applications then write the following code in the web.config file.

<system.web>
  <compilation profileGuidedOptimizations="None" />
</system.web>

But in a Windows based application, you will need to enable Multicore JIT feature explicitly.

Let's see how.

It is simple to use Multicore JIT, there is a class in the .NET Framework named "System.Runtime.ProfileOptimization" that you can use to start profiling at the entry point of your application. 

Optimization Profilers

The ProfileOptimization is a new type introduced in .Net 4.5 to improve the startup performance of application domains in applications that require the just-in-time (JIT) compiler by performing background compilation of methods that are likely to be executed, based on profiles created during previous compilations.

See the MSDN documentation for more information.

http://msdn.microsoft.com/en-IN/library/system.runtime.profileoptimization.aspx

The two methods that you can call at the entry point of your application.

SetProfileRoot: This method is used to specify the root path, where to save the JIT profile compiled information for optimization.

StartProfile: This method is used to start Multcore just in-time compilation.

You must write the following code in your application constructor in order to enable Multicore JIT.

public App()
{

 ProfileOptimization.SetProfileRoot(@"C:\MyAppFolder");
 ProfileOptimization.StartProfile("Startup.Profile");

}

Now that's all to enable the Multicore feature in your application; the rest of the work will be handled by the CLR automatically.

In this post, we will consume the service from a .NET client and a web page.

Consuming Web API OData using a .NET client:

A Web API OData service can be consumed using WCF Data Services client. If you gave already worked with WCF Data Services, you already know about consuming Web API OData Service as well.

Right click on a .NET project and choose the option Add Service Reference. In the dialog, enter the OData service URL and click the Go button.

The dialog parses the metadata received from the server and shows the available entities under container as shown in the screenshot. As we created just one entity in the service, we see the entity Employee alone. Name the namespace as you wish and hit OK. Visual Studio generates some classes for the client application based on the metadata.

The generated code contains the following:

• A Container class, which is responsible for communicating with the service. It holds DataServiceQuery<TEntity> type properties for each EntitySet on the server
• A class for every entity type. This class contains all properties mapped on the server, information about key of the entity

A Container is much like a DbContext in Entity Framework. It handles all the operations. Container is responsible for building OData URLs and sending requests to the service for any operation that client asks for. Let’s start by creating a Container. Constructor of the container accepts a URI, which is base address of the Web API OData service.

Container container = new Container(new Uri("http://localhost:1908/odata"));

To fetch details of all employees, we need to invoke the Corresponding DataServiceQuery property.

var employees = container.Employees;

Although the statement looks like an in-memory operation, it generates the corresponding URL internally and calls the server. Similarly, to get details of an employee with a given Id, we can write a LINQ query as shown:

var employee = container.Employees.Where(e => e.Id == 3).FirstOrDefault();

The above query makes a call to the Get method accepting key in the Web API Controller.

To create a new employee, we need to create an object of the Employee class, add it and ask Container to save it. Following snippet demonstrates this:

Employee emp = new Employee() { Id = 0, Name = "Hari", Salary = 10000 };
container.AddToEmployees(emp);
container.SaveChanges();

Performing update is also much similar. The difference is with calling the SaveChanges method.

emp = container.Employees.Where(e => e.Id == 3).FirstOrDefault();
emp.Name = "Stacy";
container.UpdateObject(emp);
container.SaveChanges(SaveChangesOptions.ReplaceOnUpdate);

If SaveChanges is called with SaveChangesOptions.ReplaceOnUpdate, it performs PUT operation on the resource. If SaveChangesOptions.PatchOnUpdate is passed, it performs PATCH operation on the resource.

To delete an entry, we need to pass an object to DeleteObject method and just like earlier cases; we need to call the SaveChanges method on the Container.

container.DeleteObject(container.Employees.Where(e => e.Id == 3).FirstOrDefault());
container.SaveChanges();

Consuming Web API OData using JavaScript client:

To consume the Web API OData service from a web page, the service has to be called using AJAX. The client can send an AJAX request to the URL of the OData service by specifying an HTTP verb to operate on the resource. To make our life easier, let’s use jQuery for AJAX calls.

To get details of all employees, we need to send a GET request to the OData URL. Values of entries in the collection are stored in a property named value in the object received as response. Fetching details of an employee with a given Id also follows similar approach. Following snippet demonstrates this:

$.getJSON(“/odata/Employees”, function(data){
    $.each(data.value, function(){
        //Modify UI accordingly
    });
}); 

$.getJSON(“/odata/Employees(3)”, function(data){
        //Modify UI accordingly
});

To add a new employee, we need to send the new object to $.post along with the URL.

var employee = {
    "Id": 0,
    "Name": “Ravi”,
    "Salary": 10000
}; 

$.post(“/odata/Employees”, employee).done(function(data){
    //Modify UI accordingly
});

Unfortunately, jQuery doesn’t have a shorthand method for PUT. But it is quite easy with $.ajax as well. To perform PUT on the resource, the request should be sent to the specific address with an ID and the modified object should be passed with the request.

var employee = {
    "Id": 3,
    "Name": “Ravi”,
    "Salary": 10000
}; 

$.ajax({
url: "/odata/Employees(" + employee.Id + ")",
       type: "PUT",
       data: employee
});

Building request for DELETE is similar to put, we just don’t need to pass the object.

$.ajax({
url: "/odata/Employees(" + id + ")",
type: "DELETE"
});

In the recent update of ASP.NET, Microsoft released support for Friendly URLs in ASP.NET Web Forms. It is based on the concept of Routing. But, we don’t need to deal with route table to manually add the routes to be mapped. URLs of the site will be automatically made friendly after invoking when the application starts.

To get started using the Friendly URLs, we need to install the NuGet Package Microsoft.AspNet.FriendlyUrls. The package is not stable yet, so we need to search it in pre-release packages.

This package adds following files to the web application:

• Microsoft.AspNet.FriendlyUrls assembly – Contains required set of classes and interfaces
• Site.Mobile.Master – Master page for mobile devices
• ViewSwitcher.ascx – A user control that can be used to switch views from desktop view to Mobile view and vice versa

Once Visual Studio finishes installing the NuGet package, a read me file will be popped up. This file contains the steps to be followed to enable Friendly URLs on your site. All you have to do is, call the EnableFriendlyUrls extension method of RouteTable in RegisterRoutes method of RouteConfig class. This method is defined in Microsoft.AspNet.FriendlyUrls namespace.

routes.EnableFriendlyUrls();

And make sure that the RegisterRoutes method is called in Application_Start event of Global.asax:

RouteConfig.RegisterRoutes(RouteTable.Routes);

Now run the application and check URL on the address bar of your browser.

And the magic happened! As we see here, the URL doesn’t contain extension of the page.

Note: You don’t have to install NuGet package and apply the above settings if you have installed ASP.NET and Web Tools 2012.2. These changes are built into the ASP.NET web application template in the new template.

If you are using default ASP.NET 4.5 Web application template, you can invoke the Login (which resides in Account folder) page using:

http://mysite/Account/Login

You can link any page that resides in a folder using the same convention.

Hyperlinks to the pages can be replaced with the friendly convention.

<a id="loginLink" runat="server" href="~/Account/Login">Log in</a>

Data can be passed to a page using segments. Href method of FriendlyUrl class can be used for this purpose:

<a href="<%: FriendlyUrl.Href("~/BookDetails","AspNet") %>">ASP.NET</a>

This hyperlink forms the following URL:

http://mysite/BookDetails/AspNet

This data can be displayed on the page in any mark-up element. To display the topic of book sent through the above URL in a span element, we have to get the value from the segment as shown below:

<span><%: Request.GetFriendlyUrlSegments()[0].ToString() %></span>

Also, this value can be passed as a parameter to a method used for Model Binding as shown below:

public IQueryable<Customer> GetBooks([FriendlyUrlSegments]string topic)
{
    var selectedBooks = context.Books.Where(c => c.BookName.Contains(topic));
    return selectedBooks;
}

Remember that, if you are navigating to the page ListBooks.aspx with following URL,

http://mysite/ListBooks/Book/AspNet

then the parameter marked with FriendlyUrlSegments will hold the value Book/AspNet. So, this should be handled with care.

Web applications are becoming increasingly sophisticated and it is common to need to communicate with various services.

There are a number of options to accomplish this task with probably the most popular being to continually poll a server with XHR requests. Other alternatives exist that delay disconnections. These can be tricky to implement and don’t scale well (sometimes worse than polling as they keep a connection open) so aren’t used as much.

HTTP isn’t really an ideal protocol for performing frequent requests as:

- It’s not optimized for speed
- It utilizes a lot of bandwidth for every request with various headers etc sent with every request
- To keep an application up to date many requests must be sent
- Provides limited cross domain support (relying on workarounds such as JSONP
- Firewalls & proxys sometimes buffer streaming/long polling solutions increasing latency
- Long polling & streaming solutions are not very scalable

WebSockets are a new technology that attempts to resolve some of these limitations by:

- Sending the minimum amount of data necessary
- Making more efficient usage of bandwidth
- Providing cross domain support
- Still operating over HTTP so it can transverse firewalls and proxies
- Works with some load balancers (TCP l4)
- Provides support for binary data (note some JavaScript implementations don’t currently support this)

When would web sockets be a suitable protocol for your application?

You might want to consider using web sockets in the following scenarios:

- Games
- Real time data
- Chat applications
- News tickers

There is a nice set of demos at: http://www.html5rocks.com/en/tutorials/websockets/basics/ and an interesting article that compares a Web Sockets and polling solution in terms of latency & throughput at http://websocket.org/quantum.html.

Websockets pitfalls

Websockets is a relatively new protocol that has already undergone a number of versions as various issues are addressed. This is important as support across browsers varies.

At the time of writing Websockets (in some form) can be used by the following browsers (check caniuse.com for the most up to date info):

- IE10
- Chrome 13+
- Firefox 7
- Safari 5+
- Opera 11+

Earlier implementations of websockets had some security issues so your connections may work but are not secure (Firefox disabled support in Firefox 4 & 5 for this reason).

The other issue that you may encounter is that some older proxy servers don’t support the http upgrade system that websockets uses to connect so some clients may be unable to connect.

.net 4.5 Web Socket Support

.net 4.5 introduces a number of APIs for working with web sockets. If you find you need more control than the ASP.net API’s offers then look into WCF as that has also been updated.

Before we begin there are a couple of requirements for using ASP.net web sockets API:

- Application must be hosted on IIS 8 (available only with some version of Windows 8 – please note currently IIS Express currently does not work)
- Web Sockets protocol feature installed (IIS option)
- .net 4.5
- A compatible browser on the client (IE10 or Chrome will 18 work fine at time of writing)
- It would help if your Chinese birth animal was the horse

Currently Microsoft have no plans to release Websockets support for earlier versions of IIS so if you plan to run it on Windows Server 2008 then you are going to have to look at other options such ashttp://superwebsocket.codeplex.com/.

You could also look at the SignalR library from Microsoft which is designed for developing async applications and provides WebSockets (and fallback) support: https://github.com/SignalR/SignalR/wiki/WebSockets.

Example

Ok I am going to assume that you are already working with some version of Windows 8 that has IIS & ASP.net 4.5 installed. The other thing we are going to need to do is make sure IIS has the Web Sockets Protocol feature installed (this is in the add/remove programs bit):

First create a new empty ASP.net project called WebSockets

Add the Nuget package Microsoft.Websockets

Pull down the latest jQuery library and put it in a scripts directory (I am using 1.7.2) – note jQuery isn’t necessary it just saves a bit of tedious event and manipulation code.

Now add a file called index.htm and enter the following code:

<!doctype html>
<head>
<script src="Scripts/jquery-1.7.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
var name = prompt('what is your name?:');
var url = 'ws://' + window.location.hostname + window.location.pathname.replace('index.htm', 'ws.ashx') + '?name=' + name;
alert('Connecting to: ' + url);
ws = new WebSocket(url);
ws.onopen = function () {
$('#messages').prepend('Connected <br/>');
$('#cmdSend').click(function () {
ws.send($('#txtMessage').val());
$('#txtMessage').val('');
});
}
ws.onmessage = function (e) {
$('#chatMessages').prepend(e.data + '<br/>');
};
$('#cmdLeave').click(function () {
ws.close();
});
ws.onclose = function () {
$('#chatMessages').prepend('Closed <br/>');
};
ws.onerror = function (e) {
$('#chatMessages').prepend('Oops something went wront <br/>');
};
});
</script>
</head>
<body>
<input id="txtMessage" />
<input id="cmdSend" type="button" value="Send" />
<input id="cmdLeave" type="button" value="Leave" />
<br />
<div id="chatMessages" />
</body>
</html>

We need to create an http handler so add a new generic handler to the project called ws.ashx and enter the following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.Web.WebSockets;
namespace WebSockets
{
public class WSHttpHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
if (context.IsWebSocketRequest)
context.AcceptWebSocketRequest(new TestWebSocketHandler());
}
public bool IsReusable
{
get
{
return false;
}
}
}
}

Finally we need to create something to handle the websocket connection (TestWebSocketHandler that is created in the AcceptWebSocketRequest method).

Create a new class called TestWebSocketHandler and enter the following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Web;
using Microsoft.Web.WebSockets;
namespace WebSockets
{
public class TestWebSocketHandler : WebSocketHandler
{
private static WebSocketCollection clients = new WebSocketCollection();
private string name;
public override void OnOpen()
{
this.name = this.WebSocketContext.QueryString["name"];
clients.Add(this);
clients.Broadcast(name + " has connected.");
}
public override void OnMessage(string message)
{
clients.Broadcast(string.Format("{0} said: {1}", name, message));
}
public override void OnClose()
{
clients.Remove(this);
clients.Broadcast(string.Format("{0} has gone away.", name));
}
}
}

That’s all you need so now compile the project and run it in a compatible browser (IE10 or the latest Chrome will do fine) making sure you are hosting your project from IIS (project properties if you are not).

Once you have run it up you will be prompted to provide a name, then an alert box will indicate the end point of your application (ws://localhost/.. – note the secure https version is wss://).

Now open up a different browser and you should find you can via websockets!

Windows Identity Foundation 4.5 (WIF) is a framework for building identity-aware and more specifically claims-aware applications. It furthermore provides an abstraction  to the underlying protocols (ex: WS-Trust, WS-Federation, etc …) and therefore encapsulates and standardizes application security.

Developers do not need to know how to exactly implement and use those protocols anymore. Instead they may use API calls to the WIF Toolkit for implementing secure applications, thus resulting in applications which are loosely coupled to their security implementations. Tokens issued from a large scale of different security providers (including  ADFS 2.0, ACS and custom Security Token Services) can be handled.

The default configuration and behavior works great and with ease you will be able to implement it in no time. But the best of all : the WIF Toolkit is highly customizable. You may completely override and customize the default behavior on some or on all the step of the process (Protocol Module, Session Module, Claims Authorization Module, Token, STS, etc..).

WIF in its first version (1.0) is available as a runtime and as an external SDK for .NET 3.5 and .NET 4.0. You have to install it separately for being able to using it in your applications. The WIF Training Kit contains everything necessary to start with claims based security (explication, tutorials, examples, etc…).

WIF 4.5 and .NET 4.5

So what’s new in WIF 4.5 ? Well first of all WIF is now part of the .NET framework. You do not need to install it manually anymore. It is shipped and installed with .NET 4.5, which means that it is now an integral part of the framework ! Most of the classes and methods are now part of Mscorlib.dll !

Also it is now much easier and straightforward use WIF and to query for claims. Let me show this in the following example.

Create a new web application, right click on your project in the Solution Explorer and select "Identity and Access…” from the list.

You will see a new configuration wizard, which will guide you through the process of setting up a STS reference. You may either use a development STS, a business provider based on ADFS2 or Windows Azure Access Control Service (ACS).

For the example I use the development STS :

You may now run your web application and the development STS gets started automatically. When you see the little icon in the tray area you know that everything working correctly.

Now lets see how to query for a claim by using the ClaimsPrincipal in the System.Security.Claims namespace and calling its FindFirst(…) method.

Where you had to write at least 3 lines of code and do casting operations in WIF 1.0, you now have everything in a single line ! Much easier to implement, to understand, to maintain and also to extend !

Note that there are a variety of other utility methods to aid you in working with claims (FindAll, FindFirst, HasClaim, etc…) and that you have access to almost everything just by using the  ClaimsPrincipal.

Another improvement is the seamless integration of WCF 4.5 and WIF 4.5. You now can use both together much more easily. Custom service host factories or federation behaviors are not needed anymore. This can be achieved via the useIdentityConfiguration switch.

WIF 4.5 and WebFarms

Great news for all developers using WIF in a WebFarms environment. With .NET 4.5 it is finally possible to use WIF without implementing complicated and time consuming workarounds to encrypt your WIF cookies with a single encryption key.

You just configure a new MachineSessionSecurityHandler by setting it in your Web.config file and it will work without any further changes ! This has even been added to the wizard as a checkbox! How easy is that compared to the old way of resolving this problem !

WIF 4.5 and Windows Server 2012

Windows Server 2012 Domain Controllers are going to support the claims based model and provide extra claims via Kerberos (User Claims and Device Claims), which you may then query for within your WIF 4.5 implementations. This is actually a quite interesting feature.

WIF 4.5 and Visual Studio 2012

The integration of WIF tools has been completely re-designed, as you saw in my quick example above. This has been done to simplify the whole process and to render it much more comprehensive. So it is now easier to understand with less steps and quicker configuration.

As you saw above the new tools contain a local development STS which simulates a real STS (comparable to the development fabric within the Windows Azure SDK). The development STS is by the way completely configurable (Token format, port, test claims, etc..).

Furthermore, the WIF 4.5 tools and all samples are now distributed as VSIX via the Visual Studio Extensions Gallery.

Conclusion

As you can see WIF 4.5 has been greatly enhanced and industrialized. It will become the the primary choice when working with application security. Come on and give it at try,  test all these new features by downloading the Windows Identity Foundation Tools for Visual Studio 2012 RC.

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Here I will discuss with you one of them, the feature of new the FileUpload control in ASP.NET 4.5. The FileUpload control in ASP.NET extends it's functionality by supporting the upload of multiple files at once.

Prior to this latest version, the FileUpload control only supported a single file at a time, but version ASP.NET version 4.5 solves this issue very well.

Now, the FileUpload control is built to support HTML 5, therefore it is only supported in browsers supporting HTML5. For other browsers it will work like a normal file upload control in ASP.NET.

A new attribute that comes with the ASP.NET 4.5 FileUplaod control is that:

AllowMultiple: It takes either true or false.

In order to support multiple file uploads, set AllowMulitple="true" other than false.

This attribute is for the browsers that support multiple files to be uploaded and for this purpose it renders the necessary HTML5 attribute.

In addition to this control, some new properties have been included to support code-behind coding.

HasFiles: Check whether FileUpload control has multiple files or not.

PostedFiles: Basically used to get all the files from the FileUpload control in the iteration.

Both properties will help to work with the mulitple selected files in Code-Behind coding (C#).

After the preceding overview of the theory, let's proceed to implement this cool feature in an application.

First, in the ASPX page declare a FileUpload control.

Remember: Set the AllowMultiple attribute to "true" to enable the multiple file upload feature.

<asp:FileUpload runat="server" ID="UploadImages" AllowMultiple="true" />

Now, the following HTML is rendered in the browser:

<input type="file" multiple="multiple" name="FileUpload1" id="FileUpload1" />

The AllowMultiple attribute renders multiple attributes in the HTML 5.

The complete code for .aspx file will looks like:

<div>
    <asp:FileUpload runat="server" ID="UploadImages" AllowMultiple="true" />
    <asp:Button runat="server" ID="uploadedFile" Text="Upload" OnClick="uploadFile_Click" />
    <asp:Label ID="listofuploadedfiles" runat="server" />
</div>

You will see that I have attached a button's click event. So, now start to write C# for this.

In the following code I will use HasFiles and PostedFiles properties that we will see in the preceding section.

protected void uploadFile_Click(object sender, EventArgs e)
{
   if (UploadImages.HasFiles)
   {
       foreach (HttpPostedFile uploadedFile in UploadImages.PostedFiles)
       {
           uploadedFile.SaveAs(System.IO.Path.Combine(Server.MapPath("~/Images/"),
           uploadedFile.FileName)); listofuploadedfiles.Text += String.Format("{0}<br />", uploadedFile.FileName);
       }
   }
} 

In the code above I have saved each image in the Images folder of the web application from the PostedFiles collection.

Now, run the application and see the output.

Select multiple files and click on the Upload button and it will show you the list of files that have been uploaded.

This is simple code how to send email in ASP.NET 2 with Authentication. In the following tutorial, I will show you how you can authenticate smtp client when sending emails in ASP.NET 2.0.

You need to import System.Net.Mail and System.Net namespaces to test following code.

C#

string mailFrom = "FromEmailAddressHere";
string mailTo = "ToEmailAddressHere";

string subject = "ASP.NET Test Email";


string messageBody = "This email is send to you from ASP.NET";

//  Create Mail Message Object
MailMessage message = new MailMessage(mailFrom, mailTo, subject, messageBody);

// Create SmtpClient class to Send Message
SmtpClient client = new SmtpClient();

// Here you specify your smtp host address such as smtp.myserver.com
client.Host = "localhost";

// Specify that you dont want to use default credentials
client.UseDefaultCredentials = false;

// Create user credentials by using NetworkCredential class


NetworkCredential credential = new NetworkCredential();
credential.UserName = "waqas";
credential.Password = "secret";
client.Credentials = credential;
client.Send(message);

VB.NET

Dim mailFrom As String = "FromEmailAddressHere"
Dim mailTo As String = "ToEmailAddressHere"

Dim subject As String = "ASP.NET Test Email"

Dim messageBody As String = "This email is send to you from ASP.NET"

' Create Mail Message Object
Dim message As New MailMessage(mailFrom, mailTo, subject, messageBody)

' Create SmtpClient class to Send Message
Dim client As New SmtpClient()

' Here you specify your smtp host address such as smtp.myserver.com
client.Host = "localhost"

' Specify that you dont want to use default credentials
client.UseDefaultCredentials = False

' Create user credentials by using NetworkCredential class

Dim credential As New NetworkCredential()
credential.UserName = "waqas"
credential.Password = "secret"
client.Credentials = credential

client.Send(message)