DCA3102 VISUAL PROGRAMMING SEPTEMBER 2025

Description

SESSION	SEP 2025
PROGRAM	BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER	V
COURSE CODE & NAME	DCA3102 VISUAL PROGRAMMING

 

 

SET-I

 

Q1. What is event driven programming? 10          

Ans 1.

Event-driven programming is one of the most widely used programming paradigms in modern application development, especially in graphical user interface (GUI) environments. It focuses on responding to events—such as button clicks, mouse movements, key presses, form load, or system-generated notifications—rather than executing instructions in a strict sequential manner. This approach plays a crucial role in Visual Basic .NET (VB.NET), Windows Forms, web applications, and many interactive systems.

Concept of Event-Driven Programming

In traditional programming, the flow of execution is predetermined and follows a sequential

 

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Q2. Discuss the decision-making statements in VB.Net. 10          

Ans 2.

Decision-Making Statements in VB.NET

Decision-making statements allow VB.NET programs to evaluate conditions and execute different blocks of code based on logical outcomes. These statements bring flexibility, intelligence, and control to program flow, enabling applications to react differently to varying inputs, system states, or user actions. Without decision-making constructs, complex problem-

 

 

Q3. Examine the Just-In-Time (JIT) compiler’s function and importance within the.NET framework. 10   

Function and Importance of the Just-In-Time (JIT) Compiler in .NET

The Just-In-Time (JIT) compiler is one of the most critical components of the .NET framework’s execution environment. It converts Intermediate Language (IL) code into machine-level instructions at runtime. This translation allows .NET applications to run efficiently on any platform supported by the Common Language Runtime (CLR). JIT compilation provides the perfect balance between portability, performance, and optimization.

Role of IL and CLR in JIT Compilation

When VB.NET, C#, or any .NET language is compiled, the output is not directly machine code.

 

 

 

SET-II

 

 

Q4. Discuss the following

(a) Data Adapter (b) Dataset  (c) Overloading  (d) Encapsulation           10       

Ans 4.

1. Data Adapter

A Data Adapter in VB.NET acts as a bridge between a data source and the Dataset. It is responsible for retrieving data from the database and updating changes back to the database. The Data Adapter works in a disconnected manner, meaning the actual database connection remains open only during data retrieval or update operations. After data is fetched into the Dataset, the connection closes, allowing the application to work offline. A Data Adapter contains four key commands: SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand. These

 

Q5. What is exception handling in VB.NET ? 10

Ans 5.

Exception Handling in VB.NET

Exception handling in VB.NET is the structured process of detecting, managing, and responding to runtime errors. These errors may arise due to invalid input, missing files, database connectivity issues, division by zero, or unexpected system failures. Without proper exception handling, programs may crash abruptly, leading to poor user experience and data loss.

Concept of Exceptions

An exception is an event that disrupts normal program execution. VB.NET provides an

 

 

Q6. Describe the role of inheritance in VB.NET. 10         

Ans 6.

Role of Inheritance in VB.NET

Inheritance is one of the most powerful features of Object-Oriented Programming (OOP) and plays a central role in VB.NET. It allows one class to acquire the properties and methods of another class, enabling code reuse, extensibility, and hierarchical structure. Through inheritance, developers can build complex applications with cleaner, more manageable code.

Concept of Inheritance

In VB.NET, the class being inherited from is called the base class or parent class, while the class that inherits is the derived or child class. The Inherits keyword is used to establish this