First, i can not provide a link to an official documentation. But from what i’ve read every change in the bin-folder(incl. subfolders) will cause the IIS to recycle the application domain.
Abrupt Application Pool Recycling
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Any modifications in the Application’s BIN Directory
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Making changes in any Configuration File/s, like Web.config or others ( if you have any specific config file in your application say in a directory called App_Config).
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Making modifications in the Source code files in APP_CODE Directory. This maybe change in any Source code files, or adding or deleting files from this directory.
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Making changes in the Global.asax file
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Making Changes in the Machine.config file.
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Making any modifications in the Web Application’s Root Directory. This means creating files/subdirectories on the fly can lead to application pool recycling.
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Modifications for references of Web Services of App_WebReferences directory.
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Modifying the Security Settings of any directory in the Root directory. (Like specifying read security rights for everyone or any other specific user or user group.)
Here’s some reading:
- What causes an application pool in IIS to recycle?
- http://christopherdeweese.com/blog2/post/beware-writing-to-the-bin-folder-in-iis-hosted-services
- What does an IISReset do?
- http://www.iis.net/ConfigReference/system.applicationHost/applicationPools/add/recycling
- Managing, Tuning, and Configuring Application Pools in IIS 7.0
- http://varunvns.wordpress.com/2011/07/04/application-pool-restarts/