Create new AppDomain in my azure function

I need to run some code in a new app domain. So I am trying to create an instance of my object in the new app domain... Here te code I am using:

```
public static class Program
{
private static ITemplateEngineProvider _templateEngineProvider;

static Program()
{
AppDomain ad = AppDomain.CreateDomain("New domain");

ObjectHandle handle = ad.CreateInstance(
assemblyName: typeof(RazorTemplateEngineProvider).Assembly.FullName,
typeName: "RazorTemplateEngineProvider"
//ignoreCase: false,
//bindingAttr: BindingFlags.CreateInstance,
//binder: null,
//args: new object[] { new string[] { templatePath, layoutPath } },
//culture: CultureInfo.InvariantCulture,
//activationAttributes: null
);

_templateEngineProvider = (RazorTemplateEngineProvider)handle.Unwrap();
}
}
```

`RazorTemplateEngineProvider` is a custom public class that has a public constructor. It has been implemented in a class library (`MyCustomLib.dll)` I referenced inside the azure function. The class implements an interfaces defined in another class library (`IMyCustomLib.dll`) referenced only by the previous class library, not by azure function.

At the moment there is no code inside the RazorTemplateEngineProvider class:

```
public class RazorTemplateEngineProvider : MarshalByRefObject, ITemplateEngineProvider
{
public RazorTemplateEngineProvider()
{ }
}
```

When I try to do `ad.CreateInstance` a `FileNotFoundException` has been thrown:

> Could not load file or assembly 'MyCustomLib.dll, Version=1.0.0.0, Culture=neutral, PublicKeyToken=...' or one of its dependencies. The system cannot find the file specified.

But the file exists and it should be already correctly loaded... Infact if I run this 'query'

```
IEnumerable loadedAssemblies = AppDomain.CurrentDomain.GetAssemblies()
.Where(a => !a.IsDynamic && !a.FullName.Contains("Version=0.0.0.0") && File.Exists(a.Location) && !a.Location.Contains("CompiledRazorTemplates.Dynamic") && a.FullName.Contains("My"))
.Select(f => f.FullName)
.ToArray();
```

I think problem is azure because I copied and pasted my code in a console application and thereit works.

I see both my dll. So, why do I get that error?

Thank you