How to retrieve attributes onfetchxml ?????

<entity name='account'>
                                    <attribute name='fs_category' />
                                    <attribute name='fs_parentaccountcode' />
                                    <attribute name='parentaccountid' />
                                    <attribute name='accountid' />
                                    <attribute name='ownerid' />
                                    <attribute name='telephone1' />
                                    <attribute name='emailaddress1' />
                                    <attribute name='primarycontactid' />
                                    <attribute name='modifiedon' />
                                    <attribute name='accountnumber' />
                                    <attribute name='modifiedby' />
                                    <attribute name='createdon' />
                                    <attribute name='createdby' />
                                    <attribute name='fs_totalrevenue' />
                                    <attribute name='statuscode' />
                                    <attribute name='defaultpricelevelid' />
                                    <attribute name='fs_salessupporter' />
                                    <attribute name='fs_remarksforprocurement' />
                                    <attribute name='fs_salesteam2' />
                                    <attribute name='fs_market' />
                                    <attribute name='fs_nativeaccountname' />
                                    <order attribute='createdon' descending='true' />
                                    <link-entity alias='a_5e98d04200bb494ab231eadc8d4a94ec' name='systemuser' from='systemuserid' to='owninguser' link-type='outer' visible='false'>
                                        <attribute name='fs_accountid' />
                                    </link-entity>
                                </entity>
                            </fetch>";
            FetchExpression qData = new FetchExpression(fetchXml);
            EntityCollection lsData = service.RetrieveMultiple(qData);
            if (lsData.Entities.Count > 0)
            {

                foreach (var item in lsData.Entities)
                {
                    foreach (var attr in item.Attributes)
                    {
                        Console.Write("Keys Name = " + attr.Key.ToString());
                    }
                }
            }