Executing a PL/SQL Function

CREATE OR REPLACE FUNCTION func_RetrieveCount
RETURN NUMBER
IS
 intRecordCount NUMBER;
BEGIN
  SELECT COUNT(*) INTO intRecordCount FROM Products;
 RETURN intRecordCount;
END;

/

private void btnRetrieveCount_Click(object sender, EventArgs e)
{
  string _connstring = "Data Source=localhost/NEWDB;User 
  Id=EDZEHOO;Password=PASS123;";
 try
        {
    OracleConnection _connObj = new OracleConnection(_connstring);
                _connObj.Open();
                OracleCommand _cmdObj = _connObj.CreateCommand();

   _cmdObj.CommandText = "func_RetrieveCount";
                _cmdObj.CommandType = CommandType.StoredProcedure ;
 
    //Declare the return parameter
                OracleParameter _retValueParam = new OracleParameter();
                _retValueParam.ParameterName = "Any_name";
                _retValueParam.OracleDbType = OracleDbType.Int32;
                _retValueParam.Direction = ParameterDirection.ReturnValue;
                _cmdObj.Parameters.Add(_retValueParam);
 
                _cmdObj.ExecuteNonQuery();
                MessageBox.Show("The return value is :" + _retValueParam.Value.ToString());
                _connObj.Close();
                _connObj.Dispose();
                _connObj = null;
 }
  catch (Exception ex)
 {
  MessageBox.Show(ex.ToString());
 }
}