CRM 2011 CS: Query to get All Records

// Query to get All Records

    protected EntityCollection getROBs(string EntityName)
        {
            CreatOrgSvcProx cosp = new CreatOrgSvcProx();
            OrganizationServiceProxy prox = cosp.getServiceProxy();
            ColumnSet _all = new ColumnSet(true);
            QueryExpression _robQuery = new QueryExpression(EntityName);
            _robQuery.ColumnSet = _all;
            EntityCollection _allRec = prox.RetrieveMultiple(_robQuery);
            return _allRec;
        } //