Oracle 11.2.0 version connection string

I have a .net code using visual studio 2008 and the backend for it is Oracle 11.2.0.Below is the connection string:-

Connection String:

<add name="ESSADB" connectionString="Data Source =(DESCRIPTION = (ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST =<<hostanme>>)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = <<servixcename>>)));User Id=userid;password=password;" />

Still im getting the below error.Can you please help me on this?

Error:

InnerException {"The provider is not compatible with the version of Oracle client"} 

System.Exception {Oracle.DataAccess.Client.OracleException}

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