ODP.NET connection pooling issue???

We are using ODP.NET 11.2.0 and Oracle database 11G. 

we have ASP.NET web application running on IIS 7.5. 

we faced some issue related with connection pool. i saw lots of connections created by IIS even it's not concurrent call. i limited to single use and ran it. 

it keep created 6 ~10 connection immediately. 

observation is it started with single connection and executed queries multiple times 

and 2 connections were added, one with query application asked, the other one with below query 

"SELECT parameter, VALUE

  FROM SYS.nls_database_parameters
  WHERE parameter IN ('NLS_CHARACTERSET', 'NLS_NCHAR_CHARACTERSET')"

i saw same pattern for further query creation.