哪位老大帮我看看这是怎么回事儿？

我的程序里面，自动从网上挖掘信息，然后保存在一个HashTable里面，同时填充到一个ListView里面
我发现，当数据太多的时候，就会出问题
错误信息如下：
未将对象引用设置到对象的实例。
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
   at System.Windows.Forms.Control.DefWndProc(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ListView.WndProc(Message& m)
   at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.PeekMessage(MSG& msg, IntPtr hwnd, Int32 msgMin, Int32 msgMax, Int32 remove)
   at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at twodays.SmartPoper.MainWindow.Main()

那个错误行里面实际上就只有：
Application.Run(new MainWindow());
这是怎么回事儿呢？