Any valid variable name. If varname contains Null, Null is returned.
Remarks
The following example uses the Len function to return the number of characters in a string:
Dim MyString
MyString = Len("VBSCRIPT") ' MyString contains 8.
Note The LenB function is used with byte data contained in a string. Instead of returning the number of characters in a string, LenB returns the number of bytes used to represent that string.