ABS()
Array()
ASC()
CHR()
CInt()
CStr()
Date()
DateAdd()
DateDiff()
DatePart()
DateSerial()
DateValue()
Day()
Fix()
FormatCurrency()
FormatDateTime()
FormatNumber()
FormatPercent()
Hour()
InStr()
InStrRev()
Int()
IsArray()
IsDate()
IsEmpty()
IsNull()
IsNumeric()
IsObject()
Join()
LBound()
LCase()
Left()
Len()
LTrim()
Mid()
Minute()
Month()
MonthName()
Now()
Replace()
RGB()
Right()
Rnd()
Round()
RTrim()
Second()
Space()
Split()
Sqr()
strComp()
String()
StrReverse()
Time()
TimeSerial()
TimeValue()
TypeName()
UBound()
UCase()
VarType()
WeekDay()
WeekDayName()
Year()

Returns the number of characters in a string or the number of bytes required to store a variable.

Long

Len(String|varname)

"String" is any valid string; varName is any valid variable.

response.write Len("This is A Test!")

15