How to: Remove a Meeting from a Meeting Workspace

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Meetings you create through an events list are not canceled or deleted when the associated event is deleted, and it is not possible to cancel or delete a meeting from a Meeting Workspace site through the user interface. This programming task shows how you can remove a meeting from a Meeting Workspace by creating a console application that uses methods of the Lists and Meetings Web services.

To remove a meeting from a Meeting Workspace

1. Create a console application in Microsoft Visual Studio 2005 as described in How to: Create a Console Application.

2. Add Web references for both the Lists and Meetings Web services as follows:

   1. Right-click Web References in Solution Explorer, and then click Add Web Reference.

   2. In the URL box of the Add Web Reference dialog box, type the URL for the Web service, including the site to which the service applies and the virtual directory for Web services, such as the following:

      http://Server/sites/Site_Name/_vti_bin/Lists.asmx

   3. Click Add Reference.

   4. Repeat this procedure to add a reference to Meetings.asmx for the Meetings Web service.

3. Add a using directive (Imports in Visual Basic) for the System.Xml namespace to Class1.cs.

4. Add the following code example to the Main method, which starts by instantiating the Lists and Meetings Web services, authenticating the current user for use of both services, and then gathering input from the user that specifies which meeting to delete.

   Dim listObj As New Web_Reference.Lists()
   listObj.Credentials = System.Net.CredentialCache.DefaultCredentials
   
   'Get Meeting Workspace URL.
   Console.Write("Enter the URL of the Meeting Workspace: ")
   Dim baseURL As String = Console.ReadLine()
   
   'Set URL properties for both objects.
   listObj.Url = baseURL + "/_vti_bin/lists.asmx"
   meetObj.Url = baseURL + "/_vti_bin/meetings.asmx"
   
   'Get meeting InstanceID.
   Console.Write("Enter the InstanceID of the meeting: ")
   Dim InstanceID As String = Console.ReadLine()
   
   Dim xmlDoc As New XmlDocument()
   
   Dim ndQuery As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "Query", "")
   Dim ndViewFields As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "ViewFields", "")
   Dim ndQueryOptions As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "QueryOptions", "")
   
   'Create Query to filter based on the InstanceID provided.
   ndQuery.InnerXml = "<Where><Eq><FieldRef Name=""ID""/><Value Type=""Counter"">" + InstanceID + "</Value></Eq></Where>"
   
   Try
      'Call GetListItems Web service to get meeting UID.
      Dim ndResult As XmlNode = listObj.GetListItems("Meeting Series", "", ndQuery, ndViewFields, "0", ndQueryOptions)
      Dim MainNode As XmlNode = ndResult.ChildNodes.Item(1)
      MainNode = MainNode.ChildNodes.Item(1)
      Dim eventUID As XmlNode = MainNode.Attributes.GetNamedItem("ows_EventUID")
      Dim UID As String = eventUID.InnerText
   
      'Call RemoveMeeting Web service to cancel meeting.
      'NOTE: You might need to increase the sequence number depending
      'on how many updates have already been made to the meeting.
      meetObj.RemoveMeeting(0, UID, 0, DateTime.Now, True)
   
      Console.WriteLine("Meeting canceled successfully.")
   
      Catch ex As System.Web.Services.Protocols.SoapException
         Console.WriteLine(("Message:" + ControlChars.Lf + ex.Message + ControlChars.Lf + "Detail:" + ControlChars.Lf + ex.Detail.InnerText + ControlChars.Lf + "StackTrace:" + ControlChars.Lf + ex.StackTrace))
   End Try
   

   /*Create necessary objects and set credentials.*/
   Web_Reference.Meetings meetObj = 
      new Web_Reference_Folder_Name.Meetings();
   meetObj.Credentials = System.Net.CredentialCache.DefaultCredentials;
   
   Web_Reference.Lists listObj = 
      new Web_Reference.Lists();
   listObj.Credentials = System.Net.CredentialCache.DefaultCredentials;
   
   /*Get Meeting Workspace URL.*/
   Console.Write("Enter the URL of the Meeting Workspace: ");
   string baseURL = Console.ReadLine();
   
   /*Set URL properties for both objects.*/
   listObj.Url = baseURL + "/_vti_bin/lists.asmx";
   meetObj.Url = baseURL + "/_vti_bin/meetings.asmx";
   
   /*Get meeting InstanceID.*/
   Console.Write("Enter the InstanceID of the meeting: ");
   string InstanceID = Console.ReadLine();
   
   XmlDocument xmlDoc = new XmlDocument();
   
   XmlNode ndQuery = 
      xmlDoc.CreateNode(XmlNodeType.Element,"Query", "");
   XmlNode ndViewFields = 
      xmlDoc.CreateNode(XmlNodeType.Element,"ViewFields","");
   XmlNode ndQueryOptions = 
      xmlDoc.CreateNode(XmlNodeType.Element,"QueryOptions","");
   
   // Create query to filter based on the InstanceID provided.
   ndQuery.InnerXml = 
      @"<Where><Eq><FieldRef Name=""ID""/><Value Type=""Counter"">" +
      InstanceID + "</Value></Eq></Where>";
   
   try
   {
      /*Call GetListItems Web service to get meeting UID.*/
      XmlNode ndResult = 
         listObj.GetListItems("Meeting Series", "", ndQuery, 
         ndViewFields, "0", ndQueryOptions);
      XmlNode MainNode = ndResult.ChildNodes.Item(1);
      MainNode = MainNode.ChildNodes.Item(1);
      XmlNode eventUID = 
         MainNode.Attributes.GetNamedItem("ows_EventUID");
      string UID = eventUID.InnerText;
   
      /*Call RemoveMeeting Web service to cancel meeting.
      NOTE: You might need to increase the sequence number depending
      on how many updates have already been made to the meeting.*/
      meetObj.RemoveMeeting(0, UID, 0, DateTime.Now, true);
   
      Console.WriteLine("Meeting canceled successfully.");
   }
   
   catch (System.Web.Services.Protocols.SoapException ex)
   {
      Console.WriteLine("Message:\n" + ex.Message + "\nDetail:\n" + 
         ex.Detail.InnerText + "\nStackTrace:\n" + ex.StackTrace);
   }
   

   The example creates an XmlDocument object, which is used to create nodes for constructing the parameters passed to the GetListItems method. The GetListItems method returns the item from the site's Meeting Series list whose ID is equal to the instance ID specified by the user. Collaborative Application Markup Language (CAML) is used to construct the query. The ows_EventUID attribute that is returned through the GetListItems method contains the GUID identifying the Meeting Workspace site to be deleted, which is passed to the RemoveMeeting method.

5. On the Debug menu, click Start to test the application.