how can i send variables between flash actionscript 3 and c# and vice versa

I am trying out Flash CS3 to decide if I should upgrade from Mx but I have run into problems.  As I have done many times before, I have loaded my flash files into a c# form using the flash activex control.  At first it seems to work just the same as with Mx, until I try to pass variables to and from the flash.  I have tried looking up how to make actionscript 3 recive and send variables between flash and c# but have got more an more confused.  I keep reading about Flash's fantastic external api features but I can't find an example of how to use it.

Can any of you experts out there help me out and tell me where I can find a reliable, (an hopefully simple), example of how to communicate between flash cs3(actionscript 3) and c#?
SusurrusAsked:
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blue-genieConnect With a Mentor Commented:
hi there. i was just looking at externalInterface with C# today. I have to do a project next month with it, though its still in AS2. the last time i worked with a c# wrapper was in AS1 with fscommands.

i found the help file most useful for explaining how i would go about it.
have you looked there. i know its a lot of boring reading but there's a full code example there with explanations and possible security issues etc.'

oh it just occured to me. you said you haven't upgraded so you won't have access to the help file.. arggh.

the sample files can be found here.
www.adobe.com/go/learn_programmingAS3samples_flash.
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SusurrusAuthor Commented:
yep, thats my problem.  It is a little bit chicken an egg.  I want to evaluate the new as3 to see if it can do what I want before I commit to the upgrade, but before upgrading I cant get all the information I want.  Also there  doesnt seem to be a lot out on there generally yet about c# and as3 interaction.  Alll the examples I have found are AS2. I will do as you suggest though and try going through some of the samples and see if i can find anything useful.
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SusurrusAuthor Commented:
Its working!

After going through the samples I found an example project called "IntrovertIM_CSharp" which put me on the right lines.   My biggest problem turned out to be that i was using an  outdated flash active x control dll.  Once I got this sorted out, the communication proved to be fairly easy.

The most simple example of interaction between as3 and c#  is here

http://www.richapps.de/articles/externalinterface_part1/ 

 (it is written for flex users but it was easy enough to pull out the actionscript I needed)
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blue-genieCommented:
yeah i think i'm going to go with the flex approach since i just need to pop in an existing swf file.
will see. good luck to us both
:-)
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