Force an App to Use a Specific Version of the .NET Framework

I was whipping through the list of processes in Process Explorer that were ".NET" processes (processes that had some version of MSCOREE.DLL loaded into their address space). I'm still under ten, out of 75 processes total. I was curious as to what versions of the .NET Framework were being used as I had 1.0, 1.1 SP1, and 2.0 installed.

As How to: Use an Application Configuration File to Target a .NET Framework Version states, by default an application will run on the version of the .NET Framework that the application was built on, if it is present on the computer.

Most ".NET" processes were using the .NET Framework 2.0, which is what I expected. But two were using version 1.1. Since many / most apps should work fine with any "future" version of the .NET Framework (it's supposed to be backwards compatible) I thought I would try running them against the .NET Framework 2.0. The apps in question are SharpReader (0.9.7.0) and Red Gate Software's FREE SQL Prompt 2.0.

To get the apps to run against the .NET Framework 2.0, I simply added the supportedRuntime element to the startup section in the app's app.config file (progname.exe.config). At its most basic (for this purpose) the config file would look something like:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup>
        <supportedRuntime version="v2.0.50727" />
    </startup>
</configuration>

After making or changing the app config files for SharpReader and SQL Prompt, I ran the applications. Without extensive testing, the apps appear to be running and functioning just fine while using the .NET Framework 2.0.