I have a windows application that uses some references. I add the refernces using the 'Add Reference' and under the .Net tab I find the reference. I add it to my application. The application works fine.

Now I publish it to a web server. Then when I run the application from another PC it errors off on one of my added references that points to 'C:\Program Files\.....'. Error is:

Unable to run application. The application requires that assembly Advantage.Data.Provider Version 8.10.2.18 be installed in global Assembly Cache first.

What I am doing wrong?

You can't install applications into the GAC using ClickOnce technologies. You'll need to write a standard setup.exe and do it that way instead.

However once the DLL is in the GAC you could use ClickOnce to deploy the rest of the application.

/- Sam Judson : Wrox Technical Editor -/

Do you have any litterature reference or exmaples, remember, you are dealing with a "beginner" here. It sounds very complicated. If I published to a File Share location would same apply? Thank you.

Yes, the same would happen. Try adding a Setup project to your solution instead (found under "Other Project Types" or "Setup and Deployment" I forget which in VS 2005).

/- Sam Judson : Wrox Technical Editor -/

So by using a SetUp project I would bypass anything that has to do with "web", correct? I thought any "web" application had a \bin directory where I could place reference to my Data Provider (and don't have to use GAC)? This would limit the use of these references to this application only.

You said you where developing a Windows application, not a web site.

I suspect even if you where developing a web site you would still have to place the DLL in the GAC (there is a tool for doing this by the way, called gacutil.exe).

As to WHY that is I wouldn't know - only the developers would be able to tell you why they added that restriction.

/- Sam Judson : Wrox Technical Editor -/

Yes, this is a windows application that I publish (click once) to a web site. I could create a set-up project and use the msi installer and that would work. But I this case they want the app to be published to a web site.

You can still upload the .msi or .exe to a web site for download (thats basically all the ClickOnce does really, it just makes it look nicer).

/- Sam Judson : Wrox Technical Editor -/