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Asked: 2026-06-12T23:31:56+00:00

I am rolling out a WPF application which uses Entity Framework but also has

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I am rolling out a WPF application which uses Entity Framework but also has MySqlConnection connections.

On Windows 7 the rollout is fine with just .net 4 installed, but on SOME older hardware running XP I have run into difficulties.

The symptoms are varied.

  1. I install the driver and Entity Framework operations are successful but MySqlCommands fail – the event viewer either (depending on which machine) shows a FileNotFound Exception or it shows an exception relating to the .NET 2 optimiser.

  2. I install the driver and nothing works – the error is that the driver failed to load.

  3. I attempt to load the driver but the install complains that either .net 4 or .net 2 needs to be installed even though .net 4 is present.

One XP workstation out of the half dozen or so I have tried worked perfectly first time – what I noticed on this machine was that .net versions 1.1, 2.0, 3.5 and 4 were all present before I performed the MySql connector installation.

I am going to try uninstalling .net 4, reinstall .net 2 and then install the MySql connectors to see if that resolves the problem, but if I am honest I am hacking away at this without really knowing what the underlying issue is.

Can anyone enlighten me ?

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1 Answer

  1. Editorial Team

    What we found was that those workstations that had .NET 4 ‘Extended’ preinstalled, and those that had a full 2, 3.5, 4.0 history of .NET preinstalled worked without a problem.

    The workstations that only had .NET 4 ‘Client Profile’ installed were not supported by, or did not support, the MySqlConnector. We found this to be true for a number of different MySqlConnector versions.

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