Access is denied when loading an assembly

Just solved this issue in .Net, when trying to load an external assembly, an unhelpful error of FileLoadException(Access is denied).

There is a directory in

$systemdrive$\Windows\Microsoft.Net\Framework\$respective_version$\Temporary ASP.Net Files

used to store the assemblies. If ASP.Net user and IUSR_LocalMachine do not have write and modify access to it, you can end up with locked .DLLs in there.

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