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at requires the most cleanup. The common
case will be the use of Response.Write. Where I previously used it like this:
Response.Write "Test: " & iCount
it will now have to be called like this:
Response.Write("Test: " & iCount)
The way arguments are passed to subroutines and functions has changed from VBScript to Visual Basic. In
VBScript arguments were passed ByRef by default. With Visual Basic arguments are passed ByVal by default.
Tip: If you rely on the passing of arguments ByRef, explicitly include the keyword in your code to make
your code more portable to ASP+.
Performance Considerations
Although this is not strictly a migration issue, ASP+ developers will see significant performance
increases when porting their ASP code if they move all of their variable instances from loosely typed
variants to strongly typed data types. This one change alone can yield significant performance increases.
Additionally, rewriting existing COM components as managed code will eliminate many performance penalties
due to marshalling and threading.
In summary, ASP+ offers some very cool new features but they aren't entirely free. Migrating from ASP to
ASP+ will require some work. However, careful attention to the aforementioned issues today will mean that
your code ports much easier once ASP+ ships.
Chris Kinsman is Vice President of Technology at DevX.com. He is reponsible for the site architecture,
development, and day-to-day maintenance of the DevX network of sites.
case will be the use of Response.Write. Where I previously used it like this:
Response.Write "Test: " & iCount
it will now have to be called like this:
Response.Write("Test: " & iCount)
The way arguments are passed to subroutines and functions has changed from VBScript to Visual Basic. In
VBScript arguments were passed ByRef by default. With Visual Basic arguments are passed ByVal by default.
Tip: If you rely on the passing of arguments ByRef, explicitly include the keyword in your code to make
your code more portable to ASP+.
Performance Considerations
Although this is not strictly a migration issue, ASP+ developers will see significant performance
increases when porting their ASP code if they move all of their variable instances from loosely typed
variants to strongly typed data types. This one change alone can yield significant performance increases.
Additionally, rewriting existing COM components as managed code will eliminate many performance penalties
due to marshalling and threading.
In summary, ASP+ offers some very cool new features but they aren't entirely free. Migrating from ASP to
ASP+ will require some work. However, careful attention to the aforementioned issues today will mean that
your code ports much easier once ASP+ ships.
Chris Kinsman is Vice President of Technology at DevX.com. He is reponsible for the site architecture,
development, and day-to-day maintenance of the DevX network of sites.
