为什么调用findwindow说在以下方法或属性之间的调用不明确？

C# code

 [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]        private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);        [DllImport("user32.dll", CharSet = CharSet.Auto)]        public static extern int PostMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);        public const int WM_CLOSE = 0x10;         private System.ComponentModel.Container component = null;         protected override void Dispose( bool disposing )         {             if( disposing )             {                 if (component != null)                 {                     component.Dispose();                 }             }             base.Dispose( disposing );         } private void timer1_Tick(object sender, EventArgs e)        {            KillMessageBox();            //停止计时器            ((Timer)sender).Stop();        }      private void StartKiller()      {          Timer timer = new Timer();          timer.Interval = 10000;    //10秒启动          timer.Tick += new EventHandler(timer1_Tick);          timer.Start();      }        private void KillMessageBox()        {            //查找MessageBox的弹出窗口,注意对应标题            IntPtr ptr = FindWindow(null,"MessageBox");            if(ptr != IntPtr.Zero)            {                //查找到窗口则关闭                PostMessage(ptr,WM_CLOSE,IntPtr.Zero,IntPtr.Zero);            }        }

在以下方法或属性之间的调用不明确:“setup.安装.FindWindow(string, string)”和“setup.安装.FindWindow(string, string)”D:\setup\setup\Form1.cs24026setup

为什么有一个错误？


[解决办法]
public extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
[解决办法]
重写、重命名不就行了