MEF loading plugins from a network shared folder
<?xml version="1.0" encoding="utf-8" ?>
    <configuration>
      <runtime>
        <loadFromRemoteSources enabled="true"/>
      </runtime>

AssemblyName assemblyName = AssemblyName.GetAssembly();
    Assembly.Load(assemblyName);

<runtime>
    <loadFromRemoteSources enabled="true"/>
</runtime>

string[] files = Directory.GetFiles(ClientPluginStore, "*.dll", SearchOption.TopDirectoryOnly);

AggregateCatalog aggCat = new AggregateCatalog();

aggCat.Catalogs.Add(catalog);

foreach ( string file in files )
{
    Assembly ass = Assembly.LoadFrom(file);

    AssemblyCatalog assCat = new AssemblyCatalog(ass);

    aggCat.Catalogs.Add(assCat);
}

_container = new CompositionContainer(aggCat);