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ASP.NET's Compilation Model
When IIS maps an HTTP request to ASP.NET, the ASP.NET runtime compiles the file into an assembly and shadow-copies the assembly into a temporary directory. (On Windows 2000, the directory is \Winnt\Microsoft.NET\Framework\v1.0.3705\Temporary ASP.NET Files.) Whenever ASP.NET detects that the source files are newer than the already-compiled assembly, it recompiles the assembly.If you've ever worked with classic ASP, you might have come across a situation in which you've had to shut down the entire site to replace components because the components were in use. By performing the shadow copy described above, ASP.NET solves this problem. You can simply copy new source code and components over the old code and components because the files in your deployment directory are not locked. ASP.NET will recompile the new source code into a new assembly, copy the assembly to the temporary directory, and use the new assembly to service new requests.Next, we'll take a look at the most common kind of request: one for a file with an ASPX extension.
