You have to set the Pooling connection string parameter to 'True'. By default, if not specified explicitly, the Pooling parameter value is equal to 'True'.
Another way is to initialize the connection via the OracleConnectionStringBuilder class object. This object has the Pooling property. Set the value of this property to 'True' and for the connection initialized by this object, Connection pool will be used.
For more information, please refer to
http://www.devart.com/dotconnect/oracle ... tring.html
http://www.devart.com/dotconnect/oracle ... oling.html