[OperationContract(AsyncPattern = true, Action = "http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices/GetUserModel", ReplyAction = "*")]
IAsyncResult BeginGetUserModel(GetUserModelRequest request, AsyncCallback callback, object asyncState)
<OperationContract(AsyncPattern:=True, Action:="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices/GetUserModel", ReplyAction:="*")>
Function BeginGetUserModel(request As GetUserModelRequest, callback As AsyncCallback, asyncState As Object) As IAsyncResult