I have a problem in this code:

public static T[] GetExtras <T>(Type[] Types)
{

   List<T> Res = new List<T>();
   foreach (object Current in GetExtras(typeof(T), Types))
   {
      Res.Add((T)Current);//this is the error
   } 
   return Res.ToArray();

}
public static object[] GetExtras(Type ExtraType, Type[] Types)
    {
        lock (ExtraType)
        {
            if (!ExtraType.IsInterface)
                return new object[] { };
            List<object> Res = new List<object>();
            bool found = false;
            found = (ExtraType == typeof(IExtra));
            foreach (Type CurInterFace in ExtraType.GetInterfaces())
            {
                if (found = (CurInterFace == typeof(IExtra)))
                    break;

            }
            if (!found) return new object[] { };

            foreach (Type CurType in Types)
            {
                found = false;
                if (!CurType.IsClass) continue;
                foreach (Type CurInterface in CurType.GetInterfaces())
                {
                    try
                    {
                        if (found = (CurInterface.FullName == ExtraType.FullName))
                            break;
                    }
                    catch
                    {

                    }
                }
                try
                {
                    if (found)
                        Res.Add(Activator.CreateInstance(CurType));
                }
                catch { }
            }
            return Res.ToArray();
        }
    }

When I'm using this code in windows application it works! But I cant use it on ASP page. Why?