Important Questions and Answers on Visual and Internet Programming – Part 1

Introduction to Visual & Internet Programming

what is Visual Programming?

Visual Programming is a programming model that allows developers to create software 

applications using graphical interfaces and visual elements, rather than writing code in a 

text-based format.

Key Characteristics of Visual Programming:

1. Graphical Interface
2.  Drag-and-Drop Components
3.  Rapid Application Development (RAD)
4.  Minimal Coding:

Examples of Visual Programming Tools:

• Scratch:
• Visual Basic 6.0:
• Visual Studio (Windows Forms/WPF)
• Node-RED:
• Unreal Engine Blueprints

Visual programming vs Traditional programming

Concept of visual basic

What is Visual Basic(VB)?

Visual Basic is a high-level programming language developed by Microsoft. It's designed to make easily to create Windows applications, especially with graphical user interfaces (GUIs). It is an event-driven language that allows developers to drag and drop controls (like buttons and textboxes) onto a form and write code for them.

Design:

Code:

 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim IntNumber1 As Integer

        Dim IntNumber2 As Integer

        Dim IntSum As Integer

        IntNumber1 = Number1.Text

        IntNumber2 = Number2.Text

        IntSum = IntNumber1 + IntNumber2

        Sum.Text = IntSum

    End Sub

Label properties of label control:

The common properties of the text box control area

The common properties of the button 

Variable declaration:

• A variable is a named storage location in a computer's memory that holds a value or data.
• It should be a unique name for each storage, used to identify it within the program.
• Every variable has an associated data type, such as integer or string, etc, to specify the type of data it can hold.
• Dim statement is used to declare a variable in VB. (Syntax: Dim variable name As Data type).

Concept of Multiple Document Interface (MDI)

What is Multiple Document Interface?

Definition: Multiple Document Interface (MDI) is a user interface design where multiple documents 

or windows can be opened and managed within a single parent application window. Each document 

is displayed in its own child window, which is contained within the main application window.

➢ The main form called MDI form is a container for all other windows and It is called the parent 

form/window.

➢ The window in which individual documents are displayed is called child form/window.

➢ Child forms exist independently, but they are bound to the parent form.

Create an MDI Application:

✓ Create a form.

✓ Design that form according to your needs.

✓ Make it a parent form.

✓ Set the IsMdiContainer property of the form to True to make any form as parent form.

✓ Now create multiple forms that you need.

✓ To make these forms as a child form, you have to set Mdiparent property of the name of the parent form. 

ActiveX Controls:

An ActiveX control is like a little pre-made tool or gadget you can add to your Windows 

programs (like a calculator button or a calendar).

How it helps: Instead of building everything from scratch (like making a clock yourself), 

you use an ActiveX control (like a pre-built clock) that someone else made. You just drop it 

in and tell it what to do.

Ex. Imagine you’re building a toy house (your app). ActiveX controls are like pre-made 

parts (e.g., a door, a window) you buy from a store. You stick them into your house, and 

they work right away, no need to carve them yourself!

Examples: 

➢ A calendar to pick dates.

➢ A media player to play videos or music.

➢ A chart to draw graphs. Etc