Learn Visual Basic Notice. These notes were developed for the course, “ Learn. Visual Basic ” They are not intended to be a complete reference to Visual. programming language that enables you to do anything you want. ☆ Visual Basic is not, elegant or fast. ☆ Visual Basic is not, a replacement for C. ☆ Visual . Here you will get the material for computer IT and Visual Basic language (VB) related courses and tutorials. The materials for which you will get the PDF, DOC, .
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ecology, botany, and even Earth science. Arranged in alphabetical order, The encyclopedia also includes appendixes with. This book is an introductory course of Visual ruthenpress.info Before we dive into the. ruthenpress.info, a few basic ideas of programming are introduced here. What is. Published just in time for the first release of Visual Basic ruthenpress.info, Programming Visual ruthenpress.info is a programmer's complete guide to Visual ruthenpress.info
Some controls, such as Timer, are visible during development, but not when the pro gram is running. There are dozens of controls that you can use for your VB. NET pro grams. Without controls, programs would not be very useful except maybe as server proDefinition grams. Most pro grams are designed to A control is a visual object on the accomplish a specific task, with the vast screen that helps the program to majority keeping track of some sort of datacommunicate with the user by base.
Database applications by far outnumaccepting input or displaying output. So, there are really two groups of programs in the business environment: 1. Client programs: developed with languages like Visual Basic—well-suited for building front-end programs with user interfaces.
Definition Open up a Web browser, such as Microsoft Internet Explorer, and visit your favorite Multi-tasking is the process of doing Web site.
Before the page loads, minimize more than one thing at a time. Clients usually run in the foreground, therefore they are called front-end programs.
Servers usually run in the background, therefore they are called backend programs. Note also that server programs such as Microsoft SQL Server are best used on a dedicated computer. What dedicated means in the context of computing is that a computer is set aside for a specific purpose.
In the case of a database server, it usually takes more than one to handle all the clients connecting to it! Definition A front-end program is a client application that connects to a database or other server program.
Definition Just imagine all the requests that site gets on an hourly basis. Not even a top of the line PC could hope to handle a fraction of the data processing that is required at the back end to keep site running.
In the old days, befo re PCs became so cheap and readily available, and even befo re the Internet became popular, huge mainframe computers handled the data pro c e s s i n g needs of a company.
These processes usually supported sales, inventory, and payroll. When you need more than four CPUs, you start to get into custom hardware systems. Most large manufacturers offer a line of high-end servers with support for common configurations of 8, 16, 24, and 32 CPUs.
Any more processing power than that and you really need to move into a higher echelon of computing and go with a mainframe that can bring hundreds of CPUs online to handle server traffic. Server Clusters and Farms Definition However, when you ratchet up the computMulti-processing systems are coming scale to the mainframe level, the costs puters with more than one processor can go up significantly, and there is a that are capable of handling more lower-cost option.
Rather than use a single, data-processing tasks than computers with just a single processor. Where you once had just one dedicated PC hosting a database server or Web server or both , you now have two PCs.
Most modern server programs, such as Microsoft SQL Server , support clustering, and the process is automatic once set up.
You can continue to add machines to the cluster whenever yo u r server needs more processing power. The server software ensures that if one or two PCs fail, the server can continue to run. How does that work? As you can imagine, clustering is quite complicated. But server clusters are usually connected to backup systems; therefore, if part of the server fails, the backup system can restore the data that was lost. Definition A mainframe computer is a powerful, singular, data-processing computer system capable of handling an enormous amount of data very quickly and generally more powerful than any PC because both mainframes and PCs undergo upgrades during their lifetimes.
Programmers are usually highly focused people who work earnestly on someth i n g — a t tacking it with vigor and compulsion until it is completed—and I include myself in this group. But we programmers often lose track of the bigger picture, which is probably why software and hardware gurus specialize.
The two groups usually come from the same educational backgrounds but diverge into the softwa re side or the hardware side. Hardware people are usually called LAN technicians or server administrators, whereas software people are usually called software developers or programmers.
Consider the multitude of creative job titles in both p ro fessions as colorful mnemonics of the two basic groups of people. Since its inception in , more than three million other developers have become hooked on VB.
Visual Basic 1. In its more than seven versions, Visual Basic has continued to provide us with the features we need to create rich, powerful Windows applications and as our needs evolved, so too did the Visual Basic feature set.
In VB 1. Over the years, features such as these have been introduced and enhanced: VB 3.
When Windows 95 was released, VB 4. Just as Visual Basic 1. NET again opens up software development—this time to the more than three million Visual Basic developers. It makes it easier than ever before for VB developers to build scalable Web and server applications.
It provides technology to bridge the gap from traditional client-side development to the next generation of Web services and applications.
It has been a pleasure working with Craig Utley on this book. Visual Basic.
NET, and the. NET Framework. Craig explores these concepts and explains them in terms that will be familiar and relevant to VB developers.