InvalidCastException run an execution in WPF host

i got this error when I ran the execution in my WPF host.
An exception occurred inside of the call to .NET member 'CreateFromXmlFile': System.InvalidCastException: [A]TsDllCall.Person cannot be cast to [B]TsDllCall.Person. Type A originates from 'TsDllCall, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' in the context 'Default' at location 'C:xxx\Issues\TsDllHell\bin\Debug\TsDllCall.dll'. Type B originates from 'TsDllCall, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' in the context 'LoadFrom' at location 'C:\xxx\Issues\TsDllHellSeq\tsdllcall.dll'.
at TsDllCall.Person.CreateFromXmlFile(String filePath) [Error Code: -17500]
The WPF host has loaded the TsDllCall.dll. The sequence loaded the DLL from another location. Both DLLs are identical. For a reason they have to be in different location. Somehow TestStand did not realize that the WPF host has loaded the DLL, instead it tried to load it from another location.
Any idea on how to solve this? I don't want to put them in GAC if possible.
Thanks.
Attachments:
TsDllHell.zip ‏69 KB

The WPF host is statically linked to the TsDllCall.dll and it uses 'new' operator to create the object. For the function call in the sequence file, it uses XmlSerializer to create the object. It gives no error if I use the 'new' operator to create the object.
I have created the event handler for AssemblyResolve. It requested the following assembly:
TsDllCall.XmlSerializers
TsDllCall.XmlSerializers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
I have genarated the TsDllcall.XmlSerializers.dll using SGen and put it together with the 2 TsDllCall.dll. I load the one used by the sequence file in the event handler but I still get the same error. I'm not sure if I'm doing it correctly.
However, I have found another solution: http://sixlettervariable.blogspot.com/2007/05/net-xmlserializer-and.html
Place this in my app.config and the problem has gone.
<system.diagnostics>
<switches>
<add name="XmlSerialization.Compilation" value="4" />
</switches>
</system.diagnostics>
I don't know what is it doing exactly. I will use this solution for now.
Thanks for the help.

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http://technet.microsoft.com/en-us/library/hh213130.aspx
Regards,
Mike Yin
If you have any feedback on our support, please click
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Mike Yin
TechNet Community Support

InvalidCastException run an execution in WPF host

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