System.IO.FileNotFoundException: The system cannot find the file specified. in IIS 7 (web service project)

error in sending: System.IO.FileNotFoundException: The system cannot find the file specified.

I get the exception above when I deploy my web service into IIS7, and call the web 开发者_运维技巧service from the browser.

It works well in Visual Studio 2008, I can call the web service in client.

I researched on Google, and found that it might be the permission issue, as in my web service I will call a COM API, which is encapsulated into a DLL.

My question is why when I run it in Visual Studio, it works well but fails in IIS7?

And so, have you checked the permissions?

Remember that Visual Studio is not running as the same user as IIS. That means that if IUSR user does not have a permission to access a file, you will still be able to access it when running your website from Visual Studio.