Hi,

I want to use forms in my Excel application-level add-in that have the
main Excel window set as their owner. Could someone who knows these
thins tell me, am I disposing the handle correctly?

   public partial class ExcelForm : Form
   {
       NativeWindow nativeWindow;

       public void Show(IntPtr handle)
       {
           nativeWindow = new NativeWindow();
           nativeWindow.AssignHandle(handle);
           base.Show(nativeWindow);
       }

       protected override void Dispose(bool disposing)
       {
           if (disposing && (components != null)) // Windows Form
Designer generated code
           {
               components.Dispose();
           }

           // Is this the correct way and place?
           if (nativeWindow != null)
           {
               nativeWindow.ReleaseHandle();
           }

           base.Dispose(disposing);
       }
}

Usage:
ExcelForm excelForm = new ExcelForm();
excelForm.Show(new IntPtr(Application.Hwnd));