Connection String Property SubQueries

Hi! I am trying to set the connection string parameter SubQueries=2 as instructed in technet.

http://technet.microsoft.com/en-us/library/microsoft.analysisservices.adomdclient.adomdconnection.connectionstring(v=sql.105).aspx

The connection string that I have is as follow:

"Data Source=<SourceName>;Initial Catalog=<CatalogName> Statistic;User Id=<UserId>;Password=<Password>;Persist Security Info=True;SubQueries=2"

However, when i try to open the AdoMdConnection object with this connection string, it throws the error below:

Test method TEMS.Discovery.Dashboard.DataAccess.UnitTest.DataDownloadDataAccessTest.GetSignalStrengthDistribution threw exception: 
Microsoft.AnalysisServices.AdomdClient.AdomdErrorResponseException: XML for Analysis parser: The Subqueries property was not recognized.

Have I set anything wrong?

I am using SQL Server 2008R2.

Thanks!