ArgumentNullException
   在 System.Windows.Forms.ListBox.ObjectCollection.AddInternal(Object item)
   在 System.Windows.Forms.ListBox.ObjectCollection.Add(Object item)
   在 DynamicClass.Getversion()
   在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   在 System.Threading.ThreadHelper.ThreadStart()