Object cannot be created at this URL because an object named by this URL already exists

Object cannot be created at this URL because an object named by this URL already exists

Hi All,
I want to develop one application in vb.net for exchange 2000.

I tried to add one contact with the code snippet below. The same logic
is there for appointment on Microsoft's site.
(I added Microsoft CDO exchange library for 2000 & activex data object
2.5 reference to the project)

        Dim sURL As String
        sURL = "http://sbsserver/Exchange/trial/contacts"

        Dim oCn As ADODB.Connection = New ADODB.Connection()
        ' For server change oCn.Provider to "exoledb.datasource";
        oCn.Provider = "exoledb.datasource"

        oCn.Open(sURL, "", "", 0)
        If oCn.State = 1 Then
            Console.WriteLine("Good Connection")
        Else
            Console.WriteLine("Bad Connection")
            Return
        End If

        Dim iConfg As CDO.Configuration = New CDO.Configuration()
        Dim oFields As ADODB.Fields

        oFields = iConfg.Fields
        oFields.Item(CDO.CdoCalendar.cdoTimeZoneIDURN).Value =
CDO.CdoTimeZoneId.cdoPacific
        ' TODO: Set Meeting Organizer
        oFields.Item(CDO.CdoConfiguration.cdoSendEmailAddress).Value =
"organizer@example.com"
        oFields.Update()

' Below is my code in which I just removed the logic of creation of
appointment with creation of contact

Dim oContact As New CDO.Person
' ***************************************
oContact.FirstName = "FirstTrial"
oContact.LastName = "LastTrial"
oContact.Configuration = iConfg

oContact.DataSource.SaveTo sURL, , _
         ADODB.ConnectModeEnum.adModeReadWrite, _
         ADODB.RecordCreateOptionsEnum.adCreateNonCollection, _
         ADODB.RecordOpenOptionsEnum.adOpenSource, _
         "", ""
oContact = Nothing

        oCn.Close()
        oCn = Nothing
        oFields = Nothing
' ***************************************

Now here if I run the program for first time, my contact is
successfully get created in the trial's contacts folder. But if I run
this program second time, it gives me error "Object cannot be created
at this URL because an object named by this URL already exists". On
some forum, the solution to error is given as - Try to create the
contact with readWrite & Overwrite attribs. So I changed the above
creation code from
"ADODB.RecordCreateOptionsEnum.adCreateNonCollection" to
"ADODB.RecordCreateOptionsEnum.adCreateOverwrite". But it gives me the
error as "Unspecified error". So how I can create a contact or modify
existing contact in the trial's mailbox?
Further how I can create the task for Trial using similar code above?
Also please anyone point me to the right direction where I can get the
knowledge about step by step exchange programming on the internet?

Thanks in advance

date: Fri, 11 Jan 2008 05:39:36 -0800 (PST) author: Dhananjay

Re: Object cannot be created at this URL because an object named by this URL already exists

Hi,

to modify an existing contact, open the contact item first:


Dim oContact As New CDO.Person

oContact.DataSource.Open sUrl, connection....
 oContact.FirstName = "FirstTrial"
 oContact.LastName = "LastTrial"
 oContact.Configuration = iConfg
 
oContact.Save
 
Kind regards,
Henning Krause

> oContact.DataSource.SaveTo sURL, , _
>         ADODB.ConnectModeEnum.adModeReadWrite, _
>         ADODB.RecordCreateOptionsEnum.adCreateNonCollection, _
>         ADODB.RecordOpenOptionsEnum.adOpenSource, _
>         "", ""
> oContact = Nothing
> 
>        oCn.Close()
>        oCn = Nothing
>        oFields = Nothing
> ' ***************************************
> 
> Now here if I run the program for first time, my contact is
> successfully get created in the trial's contacts folder. But if I run
> this program second time, it gives me error "Object cannot be created
> at this URL because an object named by this URL already exists". On
> some forum, the solution to error is given as - Try to create the
> contact with readWrite & Overwrite attribs. So I changed the above
> creation code from
> "ADODB.RecordCreateOptionsEnum.adCreateNonCollection" to
> "ADODB.RecordCreateOptionsEnum.adCreateOverwrite". But it gives me the
> error as "Unspecified error". So how I can create a contact or modify
> existing contact in the trial's mailbox?
> Further how I can create the task for Trial using similar code above?
> Also please anyone point me to the right direction where I can get the
> knowledge about step by step exchange programming on the internet?
> 
> Thanks in advance

date: Fri, 11 Jan 2008 21:10:09 +0100 author: Henning Krause [MVP - Exchange]

Re: Object cannot be created at this URL because an object named by this URL already exists

Thanks Henning for your reply. Let me try & update the forum.

On Jan 12, 1:10 am, "Henning Krause [MVP - Exchange]"
 wrote:
> Hi,
>
> to modify an existing contact, open the contact item first:
>
> Dim oContact As New CDO.Person
>
> oContact.DataSource.Open sUrl, connection....
>  oContact.FirstName = "FirstTrial"
>  oContact.LastName = "LastTrial"
>  oContact.Configuration = iConfg
>
> oContact.Save
>
> Kind regards,
> Henning Krause
>
> > oContact.DataSource.SaveTo sURL, , _
> >         ADODB.ConnectModeEnum.adModeReadWrite, _
> >         ADODB.RecordCreateOptionsEnum.adCreateNonCollection, _
> >         ADODB.RecordOpenOptionsEnum.adOpenSource, _
> >         "", ""
> > oContact = Nothing
>
> >        oCn.Close()
> >        oCn = Nothing
> >        oFields = Nothing
> > ' ***************************************
>
> > Now here if I run the program for first time, my contact is
> > successfully get created in the trial's contacts folder. But if I run
> > this program second time, it gives me error "Object cannot be created
> > at this URL because an object named by this URL already exists". On
> > some forum, the solution to error is given as - Try to create the
> > contact with readWrite & Overwrite attribs. So I changed the above
> > creation code from
> > "ADODB.RecordCreateOptionsEnum.adCreateNonCollection" to
> > "ADODB.RecordCreateOptionsEnum.adCreateOverwrite". But it gives me the
> > error as "Unspecified error". So how I can create a contact or modify
> > existing contact in the trial's mailbox?
> > Further how I can create the task for Trial using similar code above?
> > Also please anyone point me to the right direction where I can get the
> > knowledge about step by step exchange programming on the internet?
>
> > Thanks in advance

date: Mon, 14 Jan 2008 05:48:46 -0800 (PST) author: Dhananjay