I trying to create an ISO 8583 message using openiso8583 library
It was not having the field no 17 (Date, capture) so i need to extend the class. There is reference at the wiki page for extending a message
https://code.google.com/p/openiso8583net/wiki/ExtendingIso8583
Protected Overrides Function CreateField(fieldid As Integer) As IField
If fieldid = 17 Then
Return New Field(fieldid, New Field(fieldid, New FieldDescriptor(4, FieldValidator.FieldValidators.Numeric, Formatter.Formatters.Bcd,adjuster)
Else
Return MyBase.CreateField(fieldid)
End If
End Function