Operators, conditions and loops — VB.NET — Visual Basic .NET from Basics to Advanced (with C# Comparison)

3. Operators, conditions and loops

Basic★ Must knowLesson 3 of 12

Purpose	VB.NET	C#
Equality	`=`	`==`
Not equal	`<>`	`!=`
Logical and/or (short-circuit)	`AndAlso`, `OrElse`	`&&`, `\|\|`
Logical and/or (always both)	`And`, `Or`	`&`, `\|`
Not	`Not`	`!`
String concatenation	`&` (preferred) or `+`	`+`
Integer division / modulus	`\`, `Mod`	`/` (on ints), `%`
Power	`^`	`Math.Pow`
Reference equality	`Is`, `IsNot`	`==` on references / `is null`
Ternary	`If(cond, a, b)`	`cond ? a : b`
Null-coalescing	`If(x, fallback)`	`x ?? fallback`

If marks >= 75 Then
    Console.WriteLine("Distinction")
ElseIf marks >= 35 Then
    Console.WriteLine("Pass")
Else
    Console.WriteLine("Fail")
End If

Select Case day                          ' = C# switch
    Case DayOfWeek.Saturday, DayOfWeek.Sunday
        Console.WriteLine("Weekend")
    Case Else
        Console.WriteLine("Weekday")
End Select

Select Case score
    Case Is >= 90 : grade = "A"
    Case 75 To 89 : grade = "B"
    Case Else : grade = "C"
End Select

For i As Integer = 1 To 10 Step 2       ' 1,3,5,7,9 (bounds inclusive!)
    If i = 7 Then Exit For               ' = break
    If i = 3 Then Continue For           ' = continue
    Console.Write(i)
Next

For Each name As String In names
    Console.WriteLine(name)
Next

Do While attempts < 3                    ' also: Do Until, Loop While, Loop Until, While...End While
    attempts += 1
Loop

Pitfall: If user IsNot Nothing And user.IsActive Then evaluates both sides and throws when user is Nothing — use AndAlso.