VB.NET

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VB.NET

2 VB.Net is a simple, modern, object-oriented computer programming language developed by Microsoft to combine the power of .NET Framework and the common language runtime with the productivity benefits that are the hallmark of Visual Basic. This tutorial will teach you basic VB.Net programming and will also take you through various advanced concepts related to VB.Net programming language. This tutorial has been prepared for the beginners to help them understand basic VB.Net programming. After completing this tutorial, you will find yourself at a moderate level of expertise in VB.Net programming from where you can take yourself to next levels. VB.Net programming is very much based on BASIC and Visual Basic programming languages, so if you have basic understanding on these programming languages, then it will be a fun for you to learn VB.Net programming language. © Copyright 2015 by Tutorials Point (I) Pvt. Ltd. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book can retain a copy for future reference but commercial use of this data is not allowed. Distribution or republishing any content or a part of the content of this e-book in any manner is also not allowed without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at contact@tutorialspoint.com

About the Tutorial ................................................................................................................................... 1

VB.NET

Audience ................................................................................................................................................. 1

Prerequisites ........................................................................................................................................... 1

Copyright & Disclaimer ............................................................................................................................ 1

Table of Contents .................................................................................................................................... 2

1. VB.NET - OVERVIEW ........................................................................................................... 8

Strong Programming Features VB.Net ..................................................................................................... 8

2. VB.NET - ENVIRONMENT SETUP ....................................................................................... 10

The .Net Framework ............................................................................................................................. 10

Integrated Development Environment (IDE) For VB.Net ....................................................................... 11

Writing VB.Net Programs on Linux or Mac OS ....................................................................................... 11

3. VB.NET - PROGRAM STRUCTURE ...................................................................................... 12

VB.Net Hello World Example ................................................................................................................. 12

Compile & Execute VB.Net Program ...................................................................................................... 13

4. VB.NET - BASIC SYNTAX .................................................................................................... 15

A Rectangle Class in VB.Net ................................................................................................................... 15

Identifiers .............................................................................................................................................. 17

VB.Net Keywords .................................................................................................................................. 17

5. VB.NET - DATA TYPES ........................................................................................................ 19

Data Types Available in VB.Net ............................................................................................................. 19

Example ................................................................................................................................................ 21

The Type Conversion Functions in VB.Net ............................................................................................. 22

Example ................................................................................................................................................ 24

6. VB.NET - VARIABLES .......................................................................................................... 25

VB.NET

Variable Declaration in VB.Net .............................................................................................................. 25

Variable Initialization in VB.Net ............................................................................................................ 27

Example ................................................................................................................................................ 27

Accepting Values from User .................................................................................................................. 28

Lvalues and Rvalues .............................................................................................................................. 28

7. VB.NET - CONSTANTS AND ENUMERATIONS .................................................................... 30

Declaring Constants .............................................................................................................................. 30

Example ................................................................................................................................................ 31

Print and Display Constants in VB.Net ................................................................................................... 31

Declaring Enumerations ........................................................................................................................ 32

Example ................................................................................................................................................ 33

8. VB.NET - MODIFIERS ......................................................................................................... 35

List of Available Modifiers in VB.Net ..................................................................................................... 35

9. VB.NET - STATEMENTS ...................................................................................................... 40

Declaration Statements ......................................................................................................................... 40

Executable Statements .......................................................................................................................... 44

10. VB.NET - DIRECTIVES......................................................................................................... 45

Compiler Directives in VB.Net ............................................................................................................... 45

11. VB.NET - OPERATORS ........................................................................................................ 50

Arithmetic Operators ............................................................................................................................ 50

Example ................................................................................................................................................ 51

Comparison Operators .......................................................................................................................... 52

Logical/Bitwise Operators ..................................................................................................................... 54

VB.NET

Example ................................................................................................................................................ 55

Bit Shift Operators ................................................................................................................................ 57

Example ................................................................................................................................................ 59

Assignment Operators........................................................................................................................... 60

Example ................................................................................................................................................ 61

Miscellaneous Operators ...................................................................................................................... 62

Example ................................................................................................................................................ 63

Operators Precedence in VB.Net ........................................................................................................... 64

Example ................................................................................................................................................ 65

12. VB.NET - DECISION MAKING ............................................................................................. 67

If...Then Statement ............................................................................................................................... 68

If...Then...Else Statement ...................................................................................................................... 70

The If...Else If...Else Statement .............................................................................................................. 71

Nested If Statements ............................................................................................................................. 73

Select Case Statement ........................................................................................................................... 74

Nested Select Case Statement ............................................................................................................... 76

13. VB.NET - LOOPS ................................................................................................................ 78

Do Loop ................................................................................................................................................. 79

For...Next Loop...................................................................................................................................... 82

Each...Next Loop ................................................................................................................................... 85

While... End While Loop ........................................................................................................................ 86

With... End With Statement .................................................................................................................. 88

Nested Loops ........................................................................................................................................ 89

Loop Control Statements....................................................................................................................... 91

VB.NET

Exit Statement ...................................................................................................................................... 92

Continue Statement .............................................................................................................................. 94

GoTo Statement .................................................................................................................................... 95

14. VB.NET - STRINGS ............................................................................................................. 98

Creating a String Objec .......................................................................................................................... 98

Properties of the String Class ................................................................................................................ 99

Methods of the String Class ................................................................................................................... 99

Examples ............................................................................................................................................. 105

15. VB.NET - DATE & TIME .................................................................................................... 108

Properties and Methods of the DateTime Structure ............................................................................ 109

Creating a DateTime Object ................................................................................................................ 112

Getting the Current Date and Time ..................................................................................................... 113

Formatting Date .................................................................................................................................. 114

Predefined Date/Time Formats ........................................................................................................... 115

Properties and Methods of the DateAndTime Class ............................................................................ 117

16. ARRAYS ............................................................................................................................ 121

Creating Arrays in VB.Net .................................................................................................................... 121

Dynamic Arrays ................................................................................................................................... 122

Multi-Dimensional Arrays ................................................................................................................... 124

Jagged Array........................................................................................................................................ 125

The Array Class .................................................................................................................................... 126

17. VB.NET - COLLECTIONS ................................................................................................... 131

Various Collection Classes and Their Usage ......................................................................................... 131

VB.NET

ArrayList .............................................................................................................................................. 132

Hashtable ............................................................................................................................................ 136

SortedList ............................................................................................................................................ 138

Stack ................................................................................................................................................... 142

Queue ................................................................................................................................................. 144

BitArray ............................................................................................................................................... 146

18. VB.NET - FUNCTIONS ...................................................................................................... 150

Defining a Function ............................................................................................................................. 150

Example .............................................................................................................................................. 150

Function Returning a Value ................................................................................................................. 151

Recursive Function .............................................................................................................................. 152

Param Arrays ...................................................................................................................................... 153

Passing Arrays as Function Arguments ................................................................................................ 153

19. VB.NET - SUB PROCEDURES ............................................................................................ 155

Defining Sub Procedures ..................................................................................................................... 155

Example .............................................................................................................................................. 155

Passing Parameters by Value .............................................................................................................. 156

Passing Parameters by Reference........................................................................................................ 157

20. VB.NET - CLASSES & OBJECTS.......................................................................................... 159

Class Definition ................................................................................................................................... 159

Member Functions and Encapsulation ................................................................................................ 161

Constructors and Destructors .............................................................................................................. 162

Shared Members of a VB.Net Class ..................................................................................................... 165

Inheritance .......................................................................................................................................... 166

VB.NET

Base & Derived Classes........................................................................................................................ 166

Base Class Initialization ....................................................................................................................... 168

21. VB.NET - EXCEPTION HANDLING ..................................................................................... 170

Syntax ................................................................................................................................................. 170

Exception Classes in .Net Framework .................................................................................................. 171

Handling Exceptions ............................................................................................................................ 172

Creating User-Defined Exceptions ....................................................................................................... 173

Throwing Objects ................................................................................................................................ 174

22. VB.NET - FILE HANDLING ................................................................................................ 175