Visual Basic (.NET) Cheat Sheet

Visual Basic .NET (VB.NET) is a versatile and powerful programming language used for developing a wide range of applications, from desktop to web and mobile. Whether you’re a seasoned developer or just starting with VB.NET, having a handy cheat sheet can be a lifesaver. In this blog post, we’ll explore a comprehensive Visual Basic .NET cheat sheet to help you navigate the language more efficiently.

1. Basic Syntax:

Hello World

Console.WriteLine("Hello, World!")

Variables and Data Types

Dim myString As String = "Hello"
Dim myNumber As Integer = 42
Dim myDouble As Double = 3.14

If-Else Statement

If condition Then
    ' Code to execute if the condition is true
Else
    ' Code to execute if the condition is false
End If

2. Loops:

For Loop

For i As Integer = 1 To 5
    ' Code to repeat
Next i

While Loop

While condition
    ' Code to repeat
End While

Do-While Loop

Do
    ' Code to repeat
Loop While condition

3. Arrays:

Declare and Initialize

Dim myArray() As Integer = {1, 2, 3, 4, 5}

Accessing Elements

Dim element As Integer = myArray(2)

4. Functions:

Declare a Function

Function AddNumbers(ByVal a As Integer, ByVal b As Integer) As Integer
    Return a + b
End Function

Call a Function

Dim result As Integer = AddNumbers(5, 7)

5. Object-Oriented Programming (OOP):

Class Declaration

Class MyClass
    ' Class members and methods
End Class

Constructor

Sub New()
    ' Constructor code
End Sub

Inheritance

Class MyDerivedClass
    Inherits MyBaseClass
    ' Additional members and methods
End Class

6. File Handling:

Read from a File

Dim fileContents As String = File.ReadAllText("path\to\file.txt")

Write to a File

File.WriteAllText("path\to\file.txt", "Content to write")

7. Database Connectivity:

SqlConnection and SqlCommand

Using connection As New SqlConnection(connectionString)
    connection.Open()
    Dim command As New SqlCommand("SELECT * FROM MyTable", connection)
    ' Execute command and process results
End Using

8. Exception Handling:

Try-Catch Block

Try
    ' Code that might cause an exception
Catch ex As Exception
    ' Code to handle the exception
End Try

This Visual Basic .NET cheat sheet covers essential syntax, control structures, OOP concepts, and common tasks like file handling and database connectivity. Whether you’re building desktop applications, web services, or mobile apps, keep this cheat sheet close for quick reference, and watch your VB.NET productivity soar.

FAQ