Re: Any risks if I update my ASP.NET 2.0 application to 3.5?

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Hi John

Thanks for your patience to explain it to me, and now I understand how 3.5 extends 2.0.

I finally solved the problem, and I'd like to share how I did it. Before that there is one thing I need to clarify a bit.

Have a look at the hierarchy I mentioned:
--Root folder (Project A, built in ASP.NET 2.0, is a virtual directory in IIS)
----bin folder for all binaries
----web.config A
----Subfolder B folder (Project B, built in ASP.NET 3.5)
------web.config B

What I want to emphasize is that Subfolder B (Project B) is not a Virtual Directory or an Application in IIS. Project B is still in the same application as Project A.

It take me three attempts to get the job done.

1. The first attempt is that I can leave the files and folders in the above hierarchy as is, expecting everything would be fine. The thought is that the web.config B will override web.config A, so that A and B would not affect each other. But I got the following error:

Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.
Source Error:
Line 27: <authentication mode="Windows"/>

Certainly the proposal is not what I need. Still I know that some configuration cannot be place in web.config in a sub folder. So I comment this line in web.config B:

<!--<authentication mode="Windows"/>-->

After that I openned an Ajax page in Subfolder B, I still got an error saying:

Error: ASP.NET Ajax client-side framework failed to load.

I thought the reason was probably that the modules or handlers are not able to be loaded from web.config B. I stopped here and went on to my second attempt.

2. I was thinking maybe I can put all the stuffs in web.config B into a <location> section in web.config A. In this way things in web.config A and B are still not completely mixed up, and Web.config B would not affect files out of Subfolder B.

Unfortunately, there was another error:

Parser Error Message: Only one <configSections> element allowed per config file and if present must be the first child of the root <configuration> element.

So it seems that <location> is not generous enough to accept the whole things.

3. OK, now is the time to (or I should see I have to) mix up the two web.config files. What I did was creating a new 2.0 project, put the web.config A in the new project, and then updated it to 3.5. All the 3.5 stuffs were added to web.config A (lets say it A+). Everything seemed to be fine, but it was not long before I was disappointed again.

I put the mixed web.config back into the root folder. However when I tested the Ajax page in Subfolder, the Page was always postbacked. After some time of hunting, I found this line made a difference:

<xhtmlConformance mode="Legacy"/>

So I made a modification to web.config A+.

<location path="subfolder">
<system.web>
<xhtmlConformance mode="Transitional"/>
</system.web>
</location>

Finally I got the job done, though not perfectly as I had thought.

I had hoped that there would be some documents specifying what can/cannot be put in a web.config in a sub folder, and what can/cannot be put in a <location> section. If anyone know this kind of document, do tell me and I will really appreciate it.

So, that's all (Engish is not my native language so I found myself unable to express all my feelings sometimes).

If you have any thoughts or suggestions, please let me know.

Regards
Warren
.

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