I have a C# Web Service that some of the methods (ones that return integers)
work and some do not (the ones that return a DataView.

Here is some code in the WebService that is giving me the problem.  The
oAllData function gets run on the initialization of the class.

   DataSet oAllData = new DataSet();

   [WebMethod(Description="Return a DataView of the Active Notifications")]
   public object GetActiveNotifications() {
     DataView oNeededData = new DataView(oAllData.Tables["Notification"]);
     oNeededData.RowFilter = "Status = 'Active'";

     return oNeededData;
   }

   private DataSet ConnectToDataStore() {
     DataSet oDS = new DataSet();
     oDS.ReadXml(Server.MapPath("NAAData.xml"));
     return oDS;
   }

Here is the code that runs when I click a button.  It is supposed to pass
back a DataView and then I would bind that to a DataGrid.

   private void cmndGetNotifications_Click(object sender, System.EventArgs
e) {
     TestNANAA.NAWS.NANAA oWS = new TestNANAA.NAWS.NANAA();
     DataView oDV = new DataView();
     oDV = (DataView)oWS.GetActiveNotifications();
     dgrdData.DataSource = oDV ;
     dgrdData.DataBind();
   }

However, when I click the button to do it I get the following error:

Server was unable to process request. --> There was an error generating the
XML document. --> You must implement the Add(System.Data.DataRowView) method
on System.Data.DataView because it inherits from ICollection

Line 92:          
RequestNamespace="http://www.NAMfg.com/NAMfgWebServices/NotificationsAndAlerts/",
ResponseNamespace="http://www.NAMfg.com/NAMfgWebServices/NotificationsAndAlerts/",
Use=System.Web.Services.Description.SoapBindingUse.Literal,
ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
Line 93:         public object GetActiveNotifications() {
Line 94:             object[] results =
this.Invoke("GetActiveNotifications", new object[0]);
Line 95:             return ((object)(results[0]));
Line 96:         }

I need some help here.  Pulling my hair out trying to figure out what to do.

TIA,
Kevin