Data Layer

class Data
    {
        object _connection;
        public object openConnection()
        {
            //I want to set this sqlconnection object.
            //For example when i set a prop this method return me a oledb connection
            ((SqlConnection)_connection).ConnectionString = "bla bla bla";
            ((SqlConnection)_connection).Open();
            return _connection;
        }
 
    }