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Catalog / Visual Basic .NET Cheat Sheet

Visual Basic .NET Cheat Sheet

A concise reference for Visual Basic .NET (VB.NET) syntax, concepts, and common tasks.

Language Basics

Data Types

Boolean

True or False value.

Byte

8-bit unsigned integer (0 to 255).

Short

16-bit signed integer (-32,768 to 32,767).

Integer

32-bit signed integer (-2,147,483,648 to 2,147,483,647).

Long

64-bit signed integer (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807).

Single

32-bit floating-point number.

Double

64-bit floating-point number.

Decimal

128-bit data type suitable for financial and monetary calculations.

String

Sequence of Unicode characters.

Date

Represents a date and time value.

Variable Declaration

Dim variableName As DataType

Example:

Dim age As Integer
Dim name As String = "John Doe"

Const constantName As DataType = value

Example:

Const PI As Double = 3.14159

Operators

Arithmetic

+, -, *, /, \ (integer division), Mod (modulus), ^ (exponentiation)

Comparison

=, <>, <, >, <=, >=

Logical

And, Or, Not, Xor, AndAlso (short-circuiting And), OrElse (short-circuiting Or)

Concatenation

& (string concatenation)

Assignment

=, +=, -=, *=, /=, &=

Control Flow

Conditional Statements

If...Then...Else Statement

If condition Then
    ' Code to execute if condition is true
ElseIf condition2 Then
    ' Code to execute if condition2 is true
Else
    ' Code to execute if all conditions are false
End If

Select Case Statement

Select Case variable
    Case value1
        ' Code to execute if variable = value1
    Case value2
        ' Code to execute if variable = value2
    Case Else
        ' Code to execute if variable doesn't match any case
End Select

Looping Structures

For...Next Loop

For i As Integer = start To end [Step stepValue]
    ' Code to execute
Next [i]

While...End While Loop

While condition
    ' Code to execute while condition is true
End While

Do...Loop Loop

Do [{While | Until} condition]
    ' Code to execute
Loop

Do
    ' Code to execute
Loop [{While | Until} condition]

For Each...Next Loop

For Each element As DataType In collection
    ' Code to execute for each element
Next

Exception Handling

Try...Catch...Finally Block

Try
    ' Code that might throw an exception
Catch ex As ExceptionType
    ' Code to handle the exception
Finally
    ' Code that always executes, regardless of exceptions
End Try

Throw Statement

Throw New Exception("An error occurred.")

Procedures and Functions

Sub Procedures (Void)

Sub ProcedureName([parameterList]) ' Code to execute End Sub

Example:

Sub Greet(name As String)
    Console.WriteLine("Hello, " & name & "!")
End Sub

Function Procedures (Return Value)

Function FunctionName([parameterList]) As ReturnType ' Code to execute Return returnValue End Function

Example:

Function Add(x As Integer, y As Integer) As Integer
    Return x + y
End Function

Parameters

ByVal

Passes a variable by value (a copy is passed).

ByRef

Passes a variable by reference (the original variable is passed, allowing modification).

Optional

Specifies that a parameter is optional. Must have a default value.

Optional param As DataType = defaultValue

ParamArray

Allows a procedure to accept an arbitrary number of arguments of a specified type.

ParamArray paramName() As DataType

Object-Oriented Programming

Classes

Class ClassName ' Class members (fields, properties, methods) End Class

Example:

Class Dog
    Public Name As String
    Public Sub Bark()
        Console.WriteLine("Woof!")
    End Sub
End Class

Properties

Property PropertyName As DataType Get ' Code to return the property value End Get Set(value As DataType) ' Code to set the property value End Set End Property

Example:

Private _age As Integer
Public Property Age As Integer
    Get
        Return _age
    End Get
    Set(value As Integer)
        If value >= 0 Then
            _age = value
        End If
    End Set
End Property

Inheritance

Class DerivedClass Inherits BaseClass ' Derived class members End Class

Example:

Class Animal
    Public Name As String
End Class

Class Dog
    Inherits Animal
    Public Sub Bark()
        Console.WriteLine("Woof!")
    End Sub
End Class

Interfaces

Interface InterfaceName ' Interface members (method signatures, property signatures) End Interface

Implements InterfaceName

Example:

Interface IAnimal
    Sub MakeSound()
End Interface

Class Dog
    Implements IAnimal
    Public Sub MakeSound()
        Console.WriteLine("Woof!")
    End Sub
End Class
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