When should I use Functions within a structure?

Lets say Im writing a class that does some information parsing and has many Properties. Now some of these properties could be divided into groups

eg:

my class describes some version info about the data that is coming in

eg. Major Version, Minor Version, Revision, Build Number

should I do somthing like this

VB Code:

Class MyTestClass
 
Public structure sVersion
   Dim sMajor as Short
   Dim sMinor as Short
   Dim sRevsion as Short
   Dim sBuild as Short
 
Functon Parse(strData as String)
'sets values about based on strData
End Function
End Structure
 
End Class

If it's only a function and you'll have a LOT of structs its okay, otherwise just stick out with classes