如何在两个项目之间创建事件?

我创建了两个项目( Proj_1 , Proj_2 ), 项目1 包含 Proj_1_Program.cs 和 ProjectOneClass.cs , 项目2 包含 Proj_2_Program.cs ,我需要 OnInformed 触发两者 Informed1 和 Informed2 我就是这样走到现在的:

//Proj_1_Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CrossProjectEvent
{
    class Proj_1_Program
    {
        static void Main(string[] args)
        {
            ProjectOneClass obj1 = new ProjectOneClass();
            obj1.Inform += new EventHandler(Informed1);
            obj1.InformNow();
            Console.ReadLine();
        }

        private static void Informed1(object sender, EventArgs e)
        {
            Console.WriteLine("Informed1");
        }
    }
}

//ProjectOneClass.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CrossProjectEvent
{
    public class ProjectOneClass
    {
        public event EventHandler Inform;

        public void InformNow()
        {
            OnInformed(new EventArgs());
        }

        private void OnInformed(EventArgs eventArgs) // I want this method both trigger Informed1 and Informed2
        {
            if (Inform != null)
            {
                Inform(this, eventArgs); 
            }
        }
    }
}



//Proj_2_Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using CrossProjectEvent;

namespace Proj_2
{
    public class ProjectTwoClass
    {
        public ProjectOneClass obj_proj_1;

        public ProjectTwoClass()
        {
            obj_proj_1 = new ProjectOneClass();
            obj_proj_1.Inform += new EventHandler(Informed2);
        }

        private static void Informed2(object sender, EventArgs e)
        {
            Console.WriteLine("Informed2");
        }
    }

    class Project2
    {
        static void Main(string[] args)
        {
        }
    }

}

但似乎只有 信息1 被触发,如何修复?谢谢