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Is Al Num Function
Character Types Class

Public Function IsAlNum( _
    ByVal vCharCode As Integer _
    ) As Boolean

"Is Character Alphanumeric"
Return True if the character with ASCII value vCharCode is alphanumeric (either alphabetic like "A".."Z", "a".."z", or numeric like "0".."9").
Return False otherwise.

Examples: 
    IsAlNum(Asc("A")) = True
    IsAlNum(Asc("5")) = True
    IsAlNum(Asc("#")) = False
See also: 
    IsAlpha Function
    IsDigit Function
    IsGraph Function
    IsPrint Function
    CharTypeAlNum Property
vCharCode: Character whose ASCII value is checked to determine if it belongs to the alphanumeric class.
Note: Function will generate a runtime error if vCharCode is not between 0 (zero) and 255 inclusive.

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