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Unit 2: Working of VB Applications

used by many VB programmers is none other than Visual Basic 6. We also have VB. Net, VB 2005,
VB 2008 and the latest VB 2010. Both VB 2008 and VB 2010 are fully object oriented programming
(OOP) language.
VISUAL BASIC is a VISUAL and events 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 VB, 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 VB, you just need to drag and drop
any graphical object anywhere on the form, and you can change its color any time using the
properties windows.

2.1 Working of VB Applications

The fundamental aspects of developing a standard exe file, as well as an ActiveX EXE file. We
also demonstrate the techniques for interacting between Standard EXE and ActiveX EXE programs
by passing parameter values.

2.1.1 Active Exe
We develop a simple ActiveX EXE with just one form. The name of the ActiveX component is
clsActivexEx. The example is chosen to demonstrate the use of ActiveX EXE in conjunction with
Standard EXE.

Figure 2.1: Activex-1, Dialog Box Showing the Type of Project to Open.
The selection (number/alphabet but not both) is passed on to the ActiveX EXE. Now, in the
ActiveX EXE, you select specific number (say “2”) or alphabet (say “A”). That specific number
or alphabet is again passed back to the Standard EXE. It is similar to, say, the Standard EXE selects
either birds or animals. If the Standard EXE chooses birds, then the ActiveX EXE can choose any
one of a given set of birds. It doesn’t have the option to choose any animal (because the Standard

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