Visual Basic 2005 - Language Summary v2

Assume:

   Private rand As Random = new Random
   
String
s = String.Empty String.Empty is the same as "".
s2 = s.ToUpper Create new string all in upper case.
s2 = s.ToLower Create new string all in lower case.
b = String.IsNullOrEmpty(s) True if s is null or empty.
Converting from strings to numbers
b = type.TryParse(s, var) Converts s to type, assigns to var. Returns false if bad input.
xn = Val(s) Use datatype.TryParse(s, v) instead.
Converting from numbers to strings
s = n.ToString() Converts n to a string.
s = n.ToString(fmt) Convert n to a string using string format fmt. fmt is a code character optionally followed by a digit indicating number of digits to the right of decimal point to display. If no digit specified, the default is 2.
Codes: "C" currency, "D" decimal integer (no decimal point), "F" fixed point, "N" number, "P" percent.
xs = Format(n, "currency") Use n.ToString("C") instead.
xs = Convert.ToString(n) Use n.toString() or n.ToString(fmt) instead.
Misc
d = Financial.Pmt(Rate, NPer, PV [,FV, DUE]) Calculates loan payments. See p 337.
i = rand.next(min, upto) Random integer in range min up to but not includeing upto.

Selection statements

If ... Then
    . . .
End If
If ... Then
    . . .
Else
    . . .
End If
If ... Then
    . . .
ElseIf ... Then
    . . .
ElseIf ... Then
    . . .
Else
    . . .
End If
Select Case ...
    Case v1
        . . .
    Case v2, v3
        . . .
    Case v4 To v5
        . . .
    Case Is comparison v6
        . . .
    Case Else
        . . .
End Select

Subroutines, procedures, methods, functions, ...

Private Sub name(params,...)
    . . .
End Sub

Loops: For...Next, Do...Loop

For cntr [As type] = start To end [Step stepval]
    . . .
    'Exit can be used inside to terminate loop.
Next cntr
Do {While | Until} cond
    . . . 
Loop
Do
    . . . 
Loop {While | Until} cond

Other

Types Integer, Double, Decimal, String, Boolean.
DeclarationsDim, Private, Static, Const.
Constants ControlChars.NewLine, String.Nothing.
Like patterns ? (one char), * (zero or more chars), # (digit), [...] (chars in set), [!...] (chars not in set)

Operators

Arithmetic Ops+ - * / \ mod ^
String Ops & Like
Comparison Ops= > >= < <= <> Is (object equality)
Logical Ops AndAlso OrElse Not And Or Xor
Other Ops = TypeOf

Public Domain 2007 Fred Swartz