Visual Basic 6 Cheat Sheet

Classic VB6 syntax including variable declarations, conditionals, loops, and procedures for legacy Windows desktop applications.

1 PageBeginnerApr 12, 2026

Variables & Constants

Declaring typed variables and constants.

Dim strName As StringDim intCount As IntegerDim dblPrice As DoubleDim blnActive As BooleanConst MAX_VALUE As Integer = 100strName = "World"MsgBox "Hello, " & strName & "!"

Control Flow

If statements and Select Case.

If x > 0 Then    MsgBox "Positive"ElseIf x < 0 Then    MsgBox "Negative"Else    MsgBox "Zero"End IfSelect Case grade    Case "A"        MsgBox "Excellent"    Case "B", "C"        MsgBox "Good"    Case Else        MsgBox "Needs improvement"End Select

Loops

For, Do While, and Do Until loops.

For i = 1 To 10    Debug.Print iNext iFor i = 10 To 1 Step -1    Debug.Print iNext iDo While x < 10    x = x + 1LoopDo Until x = 0    x = x - 1Loop

Subs, Functions & Arrays

Reusable procedures and array declarations.

Sub Greet(name As String)    MsgBox "Hello, " & nameEnd SubFunction Square(x As Double) As Double    Square = x * xEnd FunctionDim arr(1 To 5) As IntegerDim dynArr() As StringReDim dynArr(10)ReDim Preserve dynArr(20)

Pro Tip

Put `Option Explicit` at the top of every module — without it VB6 silently creates a new Variant variable on any misspelled name, which is one of the most common sources of hard-to-find bugs in legacy VB6 code.

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