Drag and drop attachment in outlook addin

[nitwalke@gmail.com]

Hi All,

I have created outlook addin for outlook 2003 in vsto-2008. When I have tried to allow property 'allowDrag' to textbox it gives runtime exception "dragdrop registration did not succeed". I have searched on net, got suggestion to use threading.

Thread t = new Thread(new ThreadStart(ShowForm));
t.SetApartmentState(ApartmentState.STA);
t.Start();

public void ShowForm()
{

form.ShowDialog();
form.Dispose();
}

Drag problem solved using thread but it give other problem in my application as follows
a) When I right click on context menu then form disappear.
b) Some time application hangs...

Can I solve this problem without using thread? Because handling thread will almost change my design.

Regards,
Nit

[Ken Slovak - [MVP - Outlook]]

Are you trying to use the Outlook object model from a background thread?
That's not supported and will crash or hang Outlook. You have to marshal
that background thread to the main process thread if you are using the
object model.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"nitwalke@gmail.com" <nitwalkegmail.com.418a5m@invalid> wrote in message
news:nitwalkegmail.com.418a5m@invalid...
>
> Hi All,
>
> I have created outlook addin for outlook 2003 in vsto-2008. When I have
> tried to allow property 'allowDrag' to textbox it gives runtime
> exception "dragdrop registration did not succeed". I have searched on
> net, got suggestion to use threading.
>
> Thread t = new Thread(new ThreadStart(ShowForm));
> t.SetApartmentState(ApartmentState.STA);
> t.Start();
>
> public void ShowForm()
> {
>
> form.ShowDialog();
> form.Dispose();
> }
>
> Drag problem solved using thread but it give other problem in my
> application as follows
> a) When I right click on context menu then form disappear.
> b) Some time application hangs...
>
> Can I solve this problem without using thread? Because handling thread
> will almost change my design.
>
> Regards,
> Nit
>
>
> --
> nitwalke@gmail.com
> http://forums.slipstick.com
>

[nitwalke@gmail.com]

Thanks Ken for replay.
I am not interested to use thread. I want to know, Can DragDrop registration will possible without using thread.I got following error while registering DragDrop event for text box.
"System.InvalidOperationException: DragDrop registration did not succeed. ---> System.Threading.ThreadStateException: Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it."

I searched on net and got threading solution. But Can we solve this problem without using thread?

Are you trying to use the Outlook object model from a background thread?
That's not supported and will crash or hang Outlook. You have to marshal
that background thread to the main process thread if you are using the
object model.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"nitwalke@gmail.com" <nitwalkegmail.com.418a5m@invalid> wrote in message
news:nitwalkegmail.com.418a5m@invalid...
>
> Hi All,
>
> I have created outlook addin for outlook 2003 in vsto-2008. When I have
> tried to allow property 'allowDrag' to textbox it gives runtime
> exception "dragdrop registration did not succeed". I have searched on
> net, got suggestion to use threading.
>
> Thread t = new Thread(new ThreadStart(ShowForm));
> t.SetApartmentState(ApartmentState.STA);
> t.Start();
>
> public void ShowForm()
> {
>
> form.ShowDialog();
> form.Dispose();
> }
>
> Drag problem solved using thread but it give other problem in my
> application as follows
> a) When I right click on context menu then form disappear.
> b) Some time application hangs...
>
> Can I solve this problem without using thread? Because handling thread
> will almost change my design.
>
> Regards,
> Nit
>
>
> --
> nitwalke@gmail.com
> http://forums.slipstick.com
>

[Ken Slovak - [MVP - Outlook]]

I told you the only solution I know of.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"nitwalke@gmail.com" <nitwalkegmail.com.41ez6x@invalid> wrote in message
news:nitwalkegmail.com.41ez6x@invalid...
>
> Thanks Ken for replay.
> I am not interested to use thread. I want to know, Can DragDrop
> registration will possible without using thread.I got following error
> while registering DragDrop event for text box.
> "System.InvalidOperationException: DragDrop registration did not
> succeed. ---> System.Threading.ThreadStateException: Current thread must
> be set to single thread apartment (STA) mode before OLE calls can be
> made. Ensure that your Main function has STAThreadAttribute marked on
> it."
>
> I searched on net and got threading solution. But Can we solve this
> problem without using thread?

[nitwalke@gmail.com]

I will give details about my project.
In ThisAddIn class..

[STAThread]
private void NewButtonClick()
{
Form frm = new Form();
frm.ShowDialog();
}

and in form class.
I have created textbox and set AllowDrop=True;
it gives following error

System.InvalidOperationException: DragDrop registration did not succeed. ---> System.Threading.ThreadStateException: Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it.
at System.Windows.Forms.Control.SetAcceptDrops(Boolea n accept)
--- End of inner exception stack trace ---
at System.Windows.Forms.Control.SetAcceptDrops(Boolea n accept)
at System.Windows.Forms.Control.OnHandleCreated(Event Args e)
at System.Windows.Forms.Form.OnHandleCreated(EventArg s e)
at System.Windows.Forms.Control.WmCreate(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WmCreate(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I put [STAThread] above startup method

[STAThread]
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
.
.
}

how should I proceed?

I told you the only solution I know of.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"nitwalke@gmail.com" <nitwalkegmail.com.41ez6x@invalid> wrote in message
news:nitwalkegmail.com.41ez6x@invalid...
>
> Thanks Ken for replay.
> I am not interested to use thread. I want to know, Can DragDrop
> registration will possible without using thread.I got following error
> while registering DragDrop event for text box.
> "System.InvalidOperationException: DragDrop registration did not
> succeed. ---> System.Threading.ThreadStateException: Current thread must
> be set to single thread apartment (STA) mode before OLE calls can be
> made. Ensure that your Main function has STAThreadAttribute marked on
> it."
>
> I searched on net and got threading solution. But Can we solve this
> problem without using thread?