To use Marshal.ReleaseComObject or not to use

Hi,

I have shared addIn (.net 2.0, c#)

I add custom fields to mailItem object.
Please have a look in a code snippet below:

......
.......
foreach (XmlNode field in fieldList)
{
fieldName = GetFieldName(field);
fieldValue = GetFieldValue(field);
try
{
AddCustomField(mailItem, fieldName, fieldValue);
}
catch (Exception ex)
{ // log }
}

.....
void AddCustomField(Outlook.MailItem mailItem, string fieldName,
string fieldValue)
{
Outlook.UserProperties ups = mailItem.UserProperties;
SetUserProperty(ups, fieldName, typeof(string), fieldValue);//
adds field to mailItem

Marshal.ReleaseComObject(ups);
ups = null;
}


The question is:
I add a few custom fields to mailItem in a loop, do i need to release
ups (Outlook.UserProperties)?
Can this to destroy com object (mailItem) ??

Thanks in advance.

On Aug 26, 4:40 pm, "Ken Slovak - [MVP - Outlook]"
<kenslo....TakeThisOut@mvps.org> wrote:
> Releasing "ups" will not release the mail item, only the UserProperties
> object.
>
> If you're doing this in a loop then I would use Marshal.ReleaseComObject()
> so you know when the objects are released. If this is being done only a few
> times I wouldn't bother since the objects will be garbage collected at some
> point in time after the procedure where they are in scope ends.
>
> You always need to balance the perf hit of using Marshal.ReleaseComObject()
> and GC.Collect() against the need to know that certain objects have been
> released or to prevent the build-up of objects counting against the Exchange
> open RPC channel limits.
>
> --
> 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
>
> "j" <evgeny....TakeThisOut@gmail.com> wrote in message
>
> news:643344bd-ed69-4746-b7fd-5b8cd74447d0@32g2000yqj.googlegroups.com...
>
>
>
> > Hi,
>
> > I have shared addIn (.net 2.0, c#)
>
> > I add custom fields to mailItem object.
> > Please have a look in a code snippet below:
>
> > .....
> > ......
> > foreach (XmlNode field in fieldList)
> > {
> >      fieldName = GetFieldName(field);
> >      fieldValue = GetFieldValue(field);
> >      try
> >      {
> >             AddCustomField(mailItem, fieldName, fieldValue);
> >      }
> >      catch (Exception ex)
> >     {   // log }
> > }
>
> > ....
> > void  AddCustomField(Outlook.MailItem mailItem, string fieldName,
> > string fieldValue)
> > {
> >     Outlook.UserProperties ups = mailItem.UserProperties;
> >      SetUserProperty(ups, fieldName, typeof(string), fieldValue);//
> > adds field to mailItem
>
> >      Marshal.ReleaseComObject(ups);
> >      ups = null;
> > }
>
> > The question is:
> > I add a few custom fields to mailItem in a loop, do i need to release
> > ups (Outlook.UserProperties)?
> > Can this to destroy com object (mailItem) ??
>
> > Thanks in advance.- Hide quoted text -
>
> - Show quoted text -


Thanks,

Of cause i understand that releasing "ups" will not relese the
mailItem.
So i wanted to know whether i need to release the "ups"???, btw after
the loop i also releasing the mailItem.

What do you say??