Executing a function in an appdomain

Dim domain As AppDomain = AppDomain.CreateDomain("Executor")
Dim buffer() As Byte = IO.File.ReadAllBytes("c:pathLocator.dll")
Dim asy As Assembly = domain.Load(buffer)
Dim obj As [Object] = asy.CreateInstance("Locator.Place")
Dim method As MethodInfo = obj.GetType.GetMethod("Where")
Dim result as Integer = method.Invoke(obj, New [Object]() { 1 })
AppDomain.Unload(domain)

Dim asy As Assembly = domain.Load(buffer)

'Could not load file or assembly 'Place, Version=1.0.0.0, Culture=neutral, PublicKeyToken-null' or one of it's dependencies.  The System Cannot find the specified file.'