The ASP.NET 2.0 application root directory contains a file that is named the PreCompiledApp.config file. The PreCompiledApp.config file tracks the deployment of an application, and the PreCompiledApp.config file informs ASP.NET 2.0 if ASP.NET 2.0 must compile any files at request time. The standard contents of the PreCompiledApp.config file are as follows.
<precompiledApp version="2" updatable="true"/>
The
updatable attribute that is set to the
true value applies to ASP.NET pages (.aspx files) and to user controls (.ascx files). The value does not apply to ASP.NET 2.0 application files (.asax files).
Therefore, the Global.asax file is compiled, and the Global.asax file is not updatable.