VB.NET Cheat Sheet
Core VB.NET syntax covering variables, control flow, classes and inheritance, collections, and common data types.
2 PagesBeginnerApr 5, 2026
Basics
Variables and console output.
vbnet
Module Program Sub Main() Dim name As String = "World" Console.WriteLine($"Hello, {name}!") Dim x As Integer = 42 Console.WriteLine("Value: " & x) End SubEnd Module
Control Flow
Conditionals and loops.
vbnet
Dim x As Integer = 10If x > 5 Then Console.WriteLine("big")ElseIf x = 5 Then Console.WriteLine("equal")Else Console.WriteLine("small")End IfFor i As Integer = 1 To 5 Console.WriteLine($"i = {i}")NextDim count As Integer = 0While count < 3 count += 1End While
Classes & Inheritance
Defining a base class and a derived class.
vbnet
Public Class Animal Public Property Name As String Public Sub New(name As String) Me.Name = name End Sub Public Overridable Sub Speak() Console.WriteLine($"{Name} makes a sound") End SubEnd ClassPublic Class Dog Inherits Animal Public Sub New(name As String) MyBase.New(name) End Sub Public Overrides Sub Speak() Console.WriteLine($"{Name} barks") End SubEnd Class
Collections
Generic collections and LINQ.
- Dim list As New List(Of Integer)- Generic strongly-typed list
- list.Add(5)- Appends an item to a collection
- Dim dict As New Dictionary(Of String, Integer)- Key/value map
- For Each item In list ... Next- Iterates a collection
- Array.Sort(arr)- Sorts an array in place
- list.Where(Function(x) x > 5)- LINQ filter (requires Imports System.Linq)
Data Types
Common built-in types.
- Integer- 32-bit signed integer
- Double- Double-precision floating point
- String- Immutable text type
- Boolean- True/False value
- Nothing- Null reference / default value
- Dim x As Integer?- Nullable value type
Error Handling
Structured exception handling with Try/Catch/Finally.
vbnet
Try Dim result As Integer = 10 \ 0Catch ex As DivideByZeroException Console.WriteLine("Cannot divide by zero: " & ex.Message)Catch ex As Exception When ex.Message.Contains("fatal") Console.WriteLine("Filtered: " & ex.Message)Finally Console.WriteLine("Always runs")End TryThrow New ArgumentException("bad input", NameOf(result))
LINQ Queries
Query and transform collections with LINQ.
vbnet
Dim nums = {5, 3, 8, 1, 9, 2}' Query syntaxDim evens = From n In nums Where n Mod 2 = 0 Order By n Select n' Method syntaxDim total = nums.Where(Function(n) n > 3).Sum()Dim names = people.GroupBy(Function(p) p.City) _ .Select(Function(g) g.Key)
Properties & Auto-Properties
Encapsulate fields with property syntax.
vbnet
Public Class Person ' Auto-property with default Public Property Name As String = "Unknown" ' Full property with backing field Private _age As Integer Public Property Age As Integer Get Return _age End Get Set(value As Integer) If value < 0 Then Throw New ArgumentException() _age = value End Set End Property ' Read-only Public ReadOnly Property IsAdult As Boolean Get Return _age >= 18 End Get End PropertyEnd Class
Async & Await
Asynchronous programming with the Task-based model.
vbnet
Public Async Function FetchDataAsync() As Task(Of String) Using client As New HttpClient() Dim response = Await client.GetStringAsync("https://api.example.com") Return response End UsingEnd Function' Await multipleDim results = Await Task.WhenAll(FetchDataAsync(), FetchDataAsync())
String Functions
Common string manipulation functions and methods.
- String.Format- interpolate values into a template: String.Format("{0:C}", price)
- $"..."- interpolated string literal: $"Hello {name}"
- .Substring(i, len)- extract portion of a string
- .Split(","c)- break string into an array by delimiter
- .Trim() / .TrimStart()- remove leading/trailing whitespace
- .Replace(a, b)- swap all occurrences of a substring
- .StartsWith / .Contains- boolean substring tests
- String.IsNullOrWhiteSpace- true when null, empty, or blank
Pro Tip
Enable Option Strict On at the top of your files to catch implicit narrowing conversions at compile time instead of runtime InvalidCastExceptions.
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