вопрос o Reflection!

Код:
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using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace RealNet
{
public class Demo
{

}
public class SimpleClass
{
public Demo[] demo = null;
}
class Program
{
static void Main(string[] args)
{
SimpleClass smp = new SimpleClass();
Type type = typeof(SimpleClass);
FieldInfo fld = type.GetField("demo");

Demo demo1 = new Demo();
Demo demo2 = new Demo();
Demo demo3 = new Demo();

object obj = new object[] { demo1, demo2, demo3 };
fld.SetValue(smp, obj);


}
}
}
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Exeption:
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Object of type 'System.Object[]' cannot be converted to type 'RealNet.Demo[]'.
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Вопрос:
Как конвертировать System.Object[] к RealNet.Demo[].Заранее Спасибо!