Visual Basic Tutorial

Creating a Scientific Calculator in Visual Basic

Dr.Liew — Mon, 20 May 2013 13:27:19 +0000

In Visual Basic 6, we can create a scientific calculator that resembles a typical scientific calculator albeit a simpler version. Other than the number buttons, the operator buttons and some additional buttons such as the memory button and the clear button, we have added all three trigonometric functions and the log functions.

The interface is shown below:

I want you to try writing code for this calculator and I will show you the full code later.

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Learn more about looping in Visual Basic

Dr.Liew — Fri, 17 May 2013 04:20:32 +0000

We have learned how to handle decisions making process using If…Then…Else and also Select Case program structures in Visual Basic. Another procedure that involves decisions making is looping. VB allows a procedure to be repeated many times until a condition or a set of conditions is fulfilled. This is generally called looping . Looping is a very useful feature of VB because it makes repetitive works easier. There are two kinds of loops in Visual Basic, the Do…Loop and the For…….Next loop

Learn more about looping in Visual Basic from our updated Visual Basic 6 lesson 9

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Using If…Then…Else in Visual Basic

Dr.Liew — Wed, 15 May 2013 03:15:14 +0000

To control the program flow in Visual Basic 6, we can use various conditional operators. Basically, they resemble mathematical operators. Conditional operators are very powerful tools, they let the Visual Basic 6 program compares data values and then decide what action to take, whether to execute a program or terminate the program and more. Some of the conditional operators are +, -, >, < ,>= and <=.

On top of the conditional operators, there are a few logical operators which offer added power to the Visual Basic programs. They are And, Or, Xor and Not. To effectively control the Visual Basic program flow, we shall use the If…Then…Else statement together with the conditional operators and logical operators.

Read more about conditional and logical operators and the usage of If….Then.. Else in our newly updated and enhanced Visual Basic 6 Lesson 7.

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Building Visual Basic Applications

Dr.Liew — Mon, 13 May 2013 08:14:01 +0000

Before we start building a Visual Basic 6 application, we need to understand the basic concepts of properties , events and methods. Every object in VB 6, such as a form , a command button , a text box and more have a set of properties that describe them. Setting the objects’ properties is the first step in building a Visual Basic application, i.e. designing the interface. We will learn more about setting properties in the lesson 3.

The next step in building a Visual Basic application is to write code to response to the events. Events usually comprises actions triggered by the user, such as clicking the mouse buttons, pressing a key on the keyboard, dragging an object and more.

Read more about building Visual Basic applications in our newly updated Visual Basic 6 Lesson 2

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Visual Basic 6 is Event-Driven Programming Language. What does it mean?

Dr.Liew — Sun, 12 May 2013 07:44:50 +0000

VISUAL BASIC is a VISUAL and Event-driven Programming Language. These are the main divergence from the old BASIC. In BASIC, programming is done in a text-only environment and the program is executed sequentially. In Visual Basic 6, programming is done in a graphical environment. In the old BASIC, you have to write program code for each graphical object you wish to display it on screen, including its position and its color. However, In Visual Basic 6 , you just need to drag and drop any graphical object anywhere on the form, and you can change its properties using the properties window.

In addition, Visual Basic 6 is Event-driven because we need to write code in order to perform some tasks in response to certain events. The events usually comprises but not limited to the user’s inputs. Some of the events are load, click, double click, drag and drop, pressing the keys and more. We will learn more about events in later lessons. Therefore, a Visual Basic 6 Program is made up of many subprograms, each has its own program code, and each can be executed independently and at the same time each can be linked together in one way or another.

Read more about Visual Basic 6 in our updated Visual Basic 6 lesson 1

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Visual Basic 6 Inventory Management System

Dr.Liew — Fri, 10 May 2013 10:41:23 +0000

All businesses involve inventory and need to manage it efficiently to ensure smooth running of the business activities and profitability. To manage inventory efficiently, business owners need to develop a good inventory management system . Building a sound inventory management system usually incur high cost. Fortunately, we can use Visual Basic 6 to build an inventory management system which does not require big capital, you can do it at home. In Visual Basic 6, there are a number of built-in database management tools which we can use to manage the data.

Read further to learn how to build an inventory management system in Visual Basic 6 by following the link below:

http://www.vbtutor.net/VB_Sample/inventory.htm

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Creating Databases using Visual Data Manager in Visual Basic 6

Dr.Liew — Fri, 10 May 2013 04:00:00 +0000

Database manipulation and management is an important component in Visual Basic programming. While creating databases are mostly handled by database software such Microsoft Access, MySql, Oracle, MS FoxPro and more, you can actually use a built-in database creation program in Visual Basic 6 called Visual Data Manager. Visual Data Manager can be used to create tables, add new data as well as edit data. Besides that, it can be used to modify table structure.

To learn how to create databases using Visual Data Manager , following the link below:

http://www.vbtutor.net/index.php/creating-database-using-visual-data-manager/

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Declaring Variables in Visual Basic

Dr.Liew — Thu, 09 May 2013 10:15:46 +0000

There are many types of data that we come across in our daily life. For example, we need to handle data such as names, addresses, money, date, stock quotes, statistics and more everyday. Similarly in Visual Basic, we have to deal with all sorts of of data, some can be mathematically calculated while some are in the form of text or other forms. VB divides data into different types so that it is easier to manage when we need to write the code involving those data.

Read more about variables declaration in Visual Basic in our updated Visual Basic 6 Lesson 5

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Errors Handling in Visual Basic 2012

Dr.Liew — Sat, 04 May 2013 07:30:03 +0000

Error handling is an essential procedure in Visual Basic 2012 programming because it helps make a program error-free. Error-free code not only enables the programs to run smoothly and efficiently, it can also prevent all sorts of problems from happening like program crashes or system hangs.

Errors often occur due to incorrect input from the user. For example, the user might make the mistake of attempting to enter text (string) to a box that is designed to handle only numeric values such as the weight of a person, the computer will not be able to perform arithmetic calculation for text therefore will create an error. These errors are known as synchronous errors.

Therefore a good programmer should be more alert to the parts of program that could trigger errors and should write errors handling code to help the user in managing the errors. Writing errors handling code is a good practice for Visual Basic 2012 programmers, so do not try to finish a program fast by omitting the errors handling code. However, there should not be too many errors handling code in the program as it create problems for the programmer to maintain and troubleshoot the program later.

Read More by following the link below:
http://www.vbtutor.net/index.php/visual-basic-2012-lesson-20/

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Visual Basic 2012 Tutorial

Dr.Liew — Thu, 11 Apr 2013 09:48:03 +0000

Visual Basic Express 2012 is the latest version of Visual Basic launched by Microsoft in 2012. Visual Basic Express 2012 is almost similar to Visual Basic Express 2010 but it has added many new features. The most distinct difference is that Visual Basic Express 2012 no more comes as a stand alone program, it is now integrated with other Microsoft Programming languages C# and C++ in a package called Visual Studio 2012. Further, Visual Studio Express 2012 now come in five editions, they are:

Visual Studio Express 2012 for Web
Visual Studio Express 2012 for Windows 8
Visual Studio Express 2012 for Windows Desktop
Visual Studio Express 2012 for Windows Phone
Visual Studio Team Foundation Server Express 2012
Right now we shall concentrate on learning Visual Basic 2012 Express for Windows Desktop since most of you are using old versions of windows, so you will need to download the free software from Microsoft site below:
http://www.microsoft.com/visualstudio/eng/downloads#d-2012-editions

Start learning Visual Basic 2012 now.

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