Problem in connection string by using ALWAYSON High Availability in SQL Server 2012....

Hi..

I am Using visual studio ultimate 2010 and SQL Server 2012 enterprise edition...

I have a database name as 'GBTest'

I just implemented ALWAYSON High Availability using 3 nodes in SQL Server 2012 latest feature...

among 3 nodes one as primary node and other two as secondary nodes. and 'Readable Secondary' option is 'No' on primary node and 'Yes' on two secondary node.

CLUSTER Name :- GBCLUSTER01

Availability Group Name:- GBTest_AvailGroup

and I am changing web config like this...

<add name="ConnectionString"
connectionString="Data Source=tcp:GBTest_AvailGroup,1433;Initial Catalog=GBTest;Integrated Security=SSPI" providerName="System.Data.SqlClient"/>

But its return a error...

I think there is some problem in my connection string ...Can anyone tell me the actual connection string??