private static ActivityImplementationBase GetBackingClassInstanceForWfActivity(WfActivity activity)
{
var backingClassEntity = activity.IsOfType.Select(t => t.As <ActivityType>()).First(t => t != null);
Class firstActivityBackingClass = backingClassEntity.ActivityExecutionClass;
var s = typeof(LogActivityImplementation).FullName;
var q = typeof(LogActivityImplementation).FullName;
var typeString = string.Format("{0}, {1}", firstActivityBackingClass.TypeName, ClassHelper.CheckAssemblyName(firstActivityBackingClass.AssemblyName));
var activityType = Type.GetType(typeString, true);
var activityInstance = (ActivityImplementationBase)Activator.CreateInstance(activityType);
return(activityInstance);
}