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A Peek into the Future: Transactional Memory - So
2007-02-15 01:01:01
A Peek into the Future : Trans actional Memory - So why is it not being used everywhere now? (Page 4 of 4 )This is a good question! Why isn't everyone out there using transactional memory systems already? To understand why this is the case, we need to look back at how transactional memory evolved.When transactional memory was first implemented (way back in 1995), it was implemented as a pure software scheme. What this means is that it didn't require the help of hardware at all. This was attractive because the researchers who proposed the scheme didn't have enough resources to create their own hardware scheme too.The problem with software transactional memory, though, is the cost of transaction management. A program has to be running all the time in the background, making sure that transactions are proceeding successfully! This program should be able to detect conflicts and roll back whenever a conflict happens. This costs much more than you might imagine. For instance, this program...
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Coming To Grips With COM+ - What Is COM ?
2007-02-14 19:00:05
Coming To Grip s With COM+ - What Is COM ? (Page 2 of 3 ) COM+ is said to be one of the most successful COMPONENT technologies in the world. It is easy-to-deploy, easy-to-use and easy-to-maintain. COM+ comes to us with a few advantages. Firstly MTS is now a part of the Operating System. Secondly, COM+ is entirely a part of the Windows 2000 Operating System. COM+ includes the following 4-runtime services: Queued Components This is a communication method in which a client can call a COM object even when its offline. The actions would then be executed whenever the COM object comes back online. Let me give you an example. Say your railway booking system is created using COM+ technology. The machines in the server room are down due to maintenance. Until things are back up online you really can't function normally, can you? Here's where queued components come into play. Even when the server where your COM object is stored is down, your ticket reservation personnel could keep functioning ...
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The Makeup of an XML Document - A Quick Primer
2007-02-14 19:00:05
 The Make up of an XML Document - A Quick Primer (Page 1 of 3 )Still having trouble understanding what XML is? In this article Zaid provides a quick primer in which he breaks down an XML document, detailing what each part is as he goes. A must read for the XML beginner.In recent years, the extensible markup language (XML) has been adopted by more and more businesses as an industry standard for data exchange and data sharing. XML provides a system-independent standard format for specifying the information exchanged over networks and between applications. The concept of XML is fairly simple, but the effectiveness it brings to the distributed computing world is tremendous. It revolutionizes the ways in which companies conduct business online, from Internet content delivery (wired or wireless) to electronic commerce to enterprise computing. From a developer's perspective, Java makes your application portable among different platforms, and XML makes your data portable among differen...
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How Does Google Crawl Pages & Index Them?
2007-02-14 19:00:05
A WebmasterWorld thread asks "How does Google determine which pages to crawl?" Google didn't always crawl and index pages as they do now. With the Big Daddy update Google adapted their crawl priorities, which was around April 2006. Google now bases the crawl priorities based on several factors, one of those factors includes Page Rank. As far as I understand it, pages with higher PageRank will be crawled and indexed quicker than pages with lower PageRank, as a general rule. That is one of the reasons people recommend placing links to your most important pages on your highest PageRank pages (i.e. homepage). One it will increase the PageRank of those pages and it will also give the bot easier access (higher level access) to the page. Back in the older days, it was easier to get Google to index and rank all your pages on your huge dynamic site, if the pages were search engine friendly. Now even indexing requires page popularity and trust factors. Don't even get the SEO community s...
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Coming To Grips With COM+ - Conclusion
2007-02-14 19:00:05
Coming To Grip s With COM+ - Conclusion (Page 3 of 3 ) If you've read this article carefully and you do have some past experience with component technologies, then you will know why COM+ is said to be the most powerful component technology in the world. This is just a small article; there are entire books explaining the inner workings of COM+. it really is that vast! I hope I was successful in introducing you to COM+. If you still have any problems regarding COM+ then please don't hesitate to post in the devArticles forums. I will be more than happy to help!
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Coming To Grips With COM+
2007-02-14 19:00:05
Coming To Grip s With COM+ (Page 1 of 3 )Today Neville's continuing his series of articles on COM. In this article he introduces us to COM+, comparing it side-by-side against COM.The very purpose of writing that article was to introduce you to the basics of COM. If you are already well versed with the concept of COM, then I suggest you keep on reading. Knowing COM beforehand will help you understand COM+ a lot better, which is what we will look at in this article.
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COM 101: A Quick Primer - Conclusion
2007-02-14 19:00:05
COM 101: A Quick Prim e r - Conclusion (Page 4 of 4 ) In this article I have covered the basics and fundamentals of COM to some extent. If you are a developer on the Windows platform (especially if you are -- or plan to -- develop Windows DNA, Java or .NET applications) then you can't live with knowing what COM is.This technology has gained a lot of popularity over the years. If you search the Internet you could actually find freelance programmers creating components and selling them online. Even all of the Microsoft Office products use COM to a very great extent. DISCLAIMER: The content provided in this article is not warrantied or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation best practices. We are not liable for any negative consequenc...
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COM 101: A Quick Primer - Identifying Individual C
2007-02-14 19:00:05
COM 101: A Quick Prime r - Identifying Individual Components (Page 3 of 4 ) As components are developed and used globally, we have to identify each component uniquely. Now how on earth do you think that this can be done? Well, the Open Software Foundation (OSF) came to the rescue and developed an algorithm that generates a unique identifier called the UUID (Universal Unique Identifier). In COM it's called the GUID (Global Unique Identifier). The GUID is a number, which is assigned to the interface, class or a library.We wont get too much into the details of how this algorithm works, but let me tell you the aspects it takes into consideration when its generates that unique identifier:The current date and timeThe network adapter card addressThe system clockAn automatically incremented counterNow each COM object has a unique GUID for itself, but where are all of these GUID's stored? They are stored in your registry. All COM classes are registered in the HKEY_CLASSES_ROOTCLSID key. Fo...
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COM 101: A Quick Primer - Features Of COM
2007-02-14 19:00:05
COM 101: A Quick Prime r - Feature s Of COM (Page 2 of 4 ) Lets first start by looking at some salient features COM:COM is a specification. It describes what standards you should follow in order to create a component.Now COM also includes a set of services. The specification is backed up by a set of API's. These API's include various helper functions for the COM programmer.COM is object oriented. Each COM object has its own identity and state.COM objects can link dynamically. Just visualize them as plug and play devices on your computer: just plug it in and it starts working. Pull it out when you don't need it.COM enables you to create distributed applications too. You don't even have to know where the COM object resides when you call it. It could even reside somewhere on a remote computer.COM applications can be written in any programming language.COM components are self-versioning. This means that when you upgrade an already existing COM component it is treated as another versio...
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COM 101: A Quick Primer
2007-02-14 19:00:05
COM 101: A Quick Prim e r (Page 1 of 4 )Is COM dead? To some, yes. For those who are just starting out with Win32 DNA programming however, it's a different story. In this article Nevile gives us a quick COM primer."COM is the object based model that allows different software to communicate with each other, even if they are written by different people, in different languages. COM defines the standard for developing components. A component is an application which performs a specific operation."Now I am sure this sounds like the standard definition of COM that you might have read around the Internet but COM has a lot more to it than that. In this article I will really try to explain you what COM is all about, hopefully clearing up any misconceptions or any confusion that you have about it.By the end of this article you will know the various COM types, how COM data is stored and also how COM objects are used.
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How to Access a SQL Anywhere Database with ColdFus
2007-02-14 19:00:05
How to Access a SQL Anywhere Data base with Cold Fusion - Create and verify a test query in SQL Anywhere (Page 4 of 4 ) In order to test the connectivity in a realistic manner, a query will be run on the database in SQL Anywhere server, and the same query will be run using ColdFusion with the ODBC Socket created earlier. In order to run such a query on SQL Anywhere, you need to use the Interactive SQL tool described in an earlier tutorial. Basically you should be able to access this from the shortcut on the desktop created when you installed SQL Anywhere 9, or by right clicking the database in the Sybase Central Database management utility shown earlier (Fig.1). The screen in Fig.9 shows the query as implemented using Interactive SQL together with the results returned from the query.Fig. 9The same query in ColdFusion Now the same query will be implemented in ColdFusion. Some additional CSS styling  is added to pretty up the display. The code for the ColdFusion query, Co...
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Introduction to Objects and Classes in C#, Part 2
2007-02-14 06:59:02
 Introduction to Object s and Class es in C#, Part 2 (Page 1 of 4 )After I wrote the article named Introduction to Objects and Classes in C#, I got a lot of e-mail messages asking me to create a series of articles about Objects and Classes. Actually this was a few months back (sorry for being late), but I'm here again with part two. In Part one, I explained the concepts behinds Objects and Classes but I didn't discuss why Object Oriented Programming (OOP) uses the Object and Class technique. Today, I will discuss the advantage of Objects and Classes with more details on how to understand your problems and develop your Objects for your solution.Because this series targets the true beginners, I will not use any technical expressions and I will prefer to explain concepts by examples. I presume that readers have a basic knowledge of C# (control the flow of the program, using methods and arrays, namespaces & assemblies). The first thing that y...

Introduction to Objects and Classes in C#, Part 2
2007-02-14 06:59:02
Introduction to Object s and Class es in C#, Part 2 - Comments (Page 2 of 4 )When you write applications in C# try to use comments to describe exactly how your application performs and why; try to make your application easy to understand and easy to maintain. Think about it this way: if you were to come back to your application five years after you wrote it, would you know what every line of code meant and did? What if someone was developing an application and they were trying to read through your code? Without documentation, this is difficult even for the most experienced programmers.  I think that you want to know more about classes so let's write a class and then discuss  new concepts.The Person ClassHere's a simple class called Personclass Person{    ;  // These are  3 private instance variabl es    // for&nbs p;now just consider t...
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Introduction to Objects and Classes in C#, Part 2
2007-02-14 06:59:02
Introduction to Object s and Class es in C#, Part 2 - What's a Scope? (Page 3 of 4 )Simply, the scope of a type (a variable, a method, or a class) is where you can use that type in your program. In other words, the scope defines the area of the program where that type can be accessible and referenced. When you declare a variable inside a block of code (like a method or an if statement structure), it will have a local scope, and it will be called a local-variable. Local scope means that you can't refer to that variable outside that block of code. Consider the next example.class Test{    ;  public void Test1( )    {  &nb sp;     int  ;x = 0;             ; // some code goes&n bsp;here that uses the&nbs p;x variable     }      &nbs p; public&nb...
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Introduction to Objects and Classes in C#, Part 2
2007-02-14 06:59:02
Introduction to Object s and Class es in C#, Part 2 - Private Members Only? (Page 4 of 4 )What about objects of that class? Can they access the members declared as private?In short, no, the objects of this class will not see the private member, but it will have it's own copy because as we said before the class is just a template for the contents of its object. I prefer to discuss it using an example:public class Class2{&nb sp;   private int&nbs p;x = 100;}And then I will instance 2 objects of that class inside the Main methodstatic void Main(string[]  args){    Class 2 c2 = new Class2();& nbsp;   Class2 c3&nbs p;= new Class2();  &n bsp; // Now Let's che ck if we can see  ;   // x inside& nbsp;any of these objects& nbsp;   c2.}c2 and c3 are objects of type Cla...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages - Visual Studio.NET (Page 6 of 6 )Visual Studio.NET is a major and important component of Microsoft.NET.  Microsoft has spent many years developing Visual Studio.NET. When you write C# applications you can use the command-line C# compiler, but it can be a very complicated and tedious process, even when dealing with the simplest C# application, so Microsoft developed Visual Studio.NET.  Using this powerful tool can save you a lot of time when writing applications.  VS.Net provides a drag-and-drop style where you can drag a button and drop it on a form, in the exact position you want, without writing any code; however, if you are using a text-based editor you will have to write many lines of code just to place the button on the form.  Visual studio.NET is the Microsoft development environment for .NET applications, so when you develop .NET applications you will prefer to use Visual Studio.NET.Figure 1&nbs...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages - .NET Framework Central Components (Page 5 of 6 ).NET Framework Class Library (FCL)For now think of this as the programming functionality and capability that we will use to develop our applications.  In our random number generator we use a function to perform the number generating.  This function is part of the Class Library.  Also, as a note, you can develop Windows applications, Web applications, network applications, and more using this one common library.NOTE  We haven't studied the concept of classes yet, so don't worry if you find yourself confused. Just understand that the FCL contains the programming functions that you will use to develop applications using .NET. .NET Common Language Runtime (CLR)This is a major part of the .NET Framework, but before we know what its role in .NET is, we must understand what Runtime means.Runtime is the time when you execute your program, meaning the time when...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages - Microsoft.NET Platform Components (Page 4 of 6 )Most of you will think that the Microsoft.NET Platform is just C# and Visual Studio.NET, but C# and Visual Studio.NET are just a part of the big game. As I said before, Microsoft.NET is just a name for a group of technologies.  In the book we will cover C#, Visual Basic.NET, Visual Studio.NET (VS.NET) and the .NET Framework (which we will discuss in the next section), which are all parts of the Microsoft.NET Platform.To get the whole picture in your mind you must know that there is a group of servers (Microsoft SQL Server 2000, Microsoft Application Center 2000, Microsoft Mobile Information Server 2000 and many others) that Microsoft has dubbed '.NET Enterprise Servers'.  These are also another part of the Microsoft.NET Platform.  Also, as a part of the Microsoft.NET world and Platform there are a number of new non-PC devices like Pagers, Mobile phones, PDA...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages - Meet Microsoft.NET (Page 3 of 6 )A lot of beginner programmers who learn C# don't care to understand what .NET is all about?  But, as we will see, they are setting themselves up for failure.  I can't simply jump into a technical discussion about Microsoft.NET, as I'm assuming that you don't know much about programming. I will not use any technical expressions in this section, so when you finish the book please read appendix A -- "About Microsoft.NET".Today there are more than 400 million computer users in the world, and most of them use the Internet daily for shopping, chatting, business, and many other things.  Still, there are a lot of things they can't do by using the Internet, such as comparing prices from various airlines to find the cheapest flight to Paris, or finding the nearest car rental companies and comparing their prices to find one that suits your budget, as well as many other tasks that...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages - Types of Programming Languages (Page 2 of 6 )In today's computing world, there is a wealth of various programming languages available to us; however, they can each be categorized into  one of the three major types: Machine Languages  Assembly Languages  High-Level languagesMachine LanguagesAs was mentioned earlier, a computer can only understand its own machine language.  The machine language is the language that the hardware designers create and is quite complicated if you decide to use it to create a program, simply because it consists of sets of numbers (0s and 1s). Machine language uses these sets of numbers to perform various operations.NOTE  In our Human-Computer programming languages analogy if two English-speaking people speak to each other their brains will compile the code and understand it directly. If you are a machine code programmer then you will write the code that the comput...
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Visual C#.NET, Part 1: Introduction to Programming
2007-02-14 06:59:02
Visual C#.NET, Part 1: Introduction to Prog ramming Languages (Page 1 of 6 )Learn today what you need to get started with Visual C#.NET. We'll be taking a look at the .NET Platform, the .NET Framework, as well as a quick look at Visual Studio.NET. We'll also take a brief look at the history of programming languages, including machine code, assembly language, as well as high-level languages, such as C#. This is the first chapter of Michael Youssef's book Visual C#.NET (The Absolute Power), printed here with the permission of the author.Welcome to the first chapter of my book Visual C#.NET (The Absolute Power). I hope that I will add something to your knowledge of Microsoft technologies.Before we begin with programming languages we must talk about our spoken languages (ie: English, French, etc.).  Any language is a set of keywords or symbols (words) that mean something understandable by the people who speak the language. For example the following sentence:I need a cup of Tea.Wh...
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Building XML Web Services Using C# and ASP.NET - O
2007-02-14 00:58:08
Building XML Web Service s Using C# and ASP.NET - Other web service features (Page 4 of 6 ) Web Service Attribute Almost all the time when you're developing for the "real" world, you'll want to provide a description for your web services. You might also want to change the default namespace and give your web service a different name. All of these can be changed using WebService attributes. You can add an attribute and its appropriate properties just before the class declaration, like this:[WebService(Name="Hello World", Description="Hello World Application developed by James Yang", Namespace="devArticles")]public class HelloWorld : WebServiceWhen you view the web service page now, it will look like this:Notice how the name has changed from HelloWorld to Hello World? The description attribute that we specified is also shown. The instructions on how to change the namespace attribute are gone as well, and the namespace is also changed.The biggest change however, is on the deletion of a...
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Building XML Web Services Using C# and ASP.NET - A
2007-02-14 00:58:08
Building XML Web Service s Using C# and ASP.NET - A simple web service (Page 3 of 6 ) In this section we'll build a simple web service to demonstrate the fundamentals of web service building. Our web service will contain just one method called HelloWorldMethod. HelloWorldMethod returns a string, "Hello World". We'll add modifications to this web service as we learn more about the available features of web services.Before building a web service, a virtual directory or web application must be created using IIS. You can do this by loading the IIS snap-in with MMC (start -> run -> "mmc" -> console -> open -> c:winntsystem32inetsrviis.mmc), right clicking on your web site and choosing new -> virtual directory. Call the virtual directory "HelloWorld".The following code shows the most basic web service:<%@ WebService Language="C#" class="HelloWorld"%>using System.Web.Services;public class HelloWorld : WebService { [WebMethod] public string HelloWorldMethod() { ...
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Building XML Web Services Using C# and ASP.NET - W
2007-02-14 00:58:08
Building XML Web Service s Using C# and ASP.NET - What is a web service? (Page 2 of 6 ) The term "web service" refers to a form of a component that can be used remotely. Microsoft offers two types of web services in their .NET framework: XML web services and .NET remoting. When developers refer to web services they usually mean XML web services, and in this article I will also refer to XML web services as just web services.Web services are invoked remotely using SOAP or HTTP-GET and HTTP-POST protocols. Web services are based on XML and return an "answer" to the client in XML format. Web services have all the advantages of components plus many more. The most significant benefits include: Language and platform independence: Web services can be built and consumed on any operating system just as long as that operating system supports the SOAP protocol and XML. Automatic upgrade: Unlike components, if a web service requires an update, that update is propagated to all applications consumi...
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Building XML Web Services Using C# and ASP.NET
2007-02-14 00:58:08
Building XML Web Service s Using C# and ASP.NET (Page 1 of 6 )The term "web service" has been used quite frequently lately: you hear people saying how good web services are and how they will dominate the future of software development, but what exactly are web services and how can we create them? In this article James shows us how to build two web services and also unravels all of the lingo surrounding web services.In this article we will explore the features of Microsoft ASP.NET Web Services , more specifically how to build web services. A real world example extending what I discuss in this article will be shown at the end of this article. It will utilise many things that you will learn throughout this article.To understand this article fully, you are required to have some previous knowledge of C#, ASP.NET and ADO.NET. To try the examples shown in this article for yourself, you will need the .NET Framework and Internet Information Server 5 or higher installed on your Windows NT/XP/20...
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ASP.NET Controls Explained: Part 2/2 - Conclusion
2007-02-14 00:58:08
ASP.NET Control s Explained: Part 2/2 - Conclusion (Page 4 of 4 ) Over the last two articles we've looked at a number of different methods that we can use to divide our ASP.Net pages up into a number of smaller, self-contained chunks of code. Using these methods can help our web applications become more scalable and easier to manage.The features described in this are what make ASP.NET pages so flexible, and you should use them as often as you can to separate your presentation layer from your application logic layer. Take a look at the books and links below for more information on controls. DISCLAIMER: The content provided in this article is not warrantied or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation best practices. We are not liable ...
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ASP.NET Controls Explained: Part 2/2 - Components
2007-02-14 00:58:08
ASP.NET Control s Explained: Part 2/2 - Comp onents (Page 3 of 4 ) If you've developed with classical ASP, then you will understand the pain you have to go through to develop and integrate components into your ASP web site using tools and technologies such as regsvr32 and COM+. ASP.NET has revolutionized the way components are created and used, and they are extremely easy to develop and implement.Firstly, let's find out what components really are. Put simply, components are namespaces that contain classes with methods and properties that can be reused. In classical ASP, the primary use of components was to increase the speed of ASP pages, because COM components were compiled into machine code, thus making them quicker to execute than ASP pages. In ASP.NET, both pages and controls are compiled and cached, so what are the benefits of using components over inline ASP.NET code?Well, let's think about this situation: you've just made a program that has encrypting and decrypting capabil...
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ASP.NET Controls Explained: Part 2/2 - Custom Cont
2007-02-14 00:58:08
ASP.NET Control s Explained: Part 2/2 - Custom Controls VS Components (Page 2 of 4 ) It's time to introduce custom controls and components. Custom controls provide programmers with reusable HTML outputting code that involves a small amount of processing. They are accessed through a web page (.aspx), using custom tags, just like user controls. All server controls can be thought of as custom controls that have been pre-made by Microsoft.Components on the other hand provide programmers with reusable application logic that involves some fairly intensive processing. They are accessible from a code behind page or between <script> and </script> tags in a web page. All base classes and objects developed by Microsoft can be considered pre-made components.Although both custom controls and components can do exactly the same things, their uses will become clearer as you have more experience with them. For example, you could make a menu bar using components and load a method in a com...
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ASP.NET Controls Explained: Part 2/2
2007-02-14 00:58:08
ASP.NET Control s Explained: Part 2/2 (Page 1 of 4 )In this, the final article of the two part series relating to ASP.NET controls, James teaches us about custom controls and components. He talks about creating them, as well as compiling them from the command prompt using the C# compiler. He also provides two ASP.NET examples that demonstrate how to both create and integrate custom controls and components into our ASP.NET pages.In part one of this two part series we took a look at ASP.NET user controls, HTML controls, server controls, and the code behind method. In this article (the final article in the two part series), we will take a look at custom controls and components. It is recommended that you read the first article before continuing if you haven't already.
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Building XML Web Services Using C# and ASP.NET - R
2007-02-14 00:58:08
Building XML Web Service s Using C# and ASP.NET - Real world application (Page 5 of 6 ) Well, we've learnt all of the fundamentals for building web services. It's time to put what we've learnt into practice by designing a real world example. The example application we're about to create will not contain properties, because Microsoft recommends a web service be stateless whenever possible.We are going to make a stripped-down version of Passport. Our version will contain seven methods: bool Authenticate (string username, string password): This method will authenticate a user and return true if authenticated and false if not. bool AddUser (string username, string password, string name, string email): This method will add a user to the database. If successful, the method will return true, if not the method will return false. bool DeleteUser (string username): Will delete a user from the database. If successful the method will return true, if not the method will return false. bool Edi...
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