[a33ik]

Попробуйте так:

var crm = GetCrmService();
var query = new QueryByAttribute
            {
                EntityName = EntityName.new_domain.ToString(),
                ColumnSet = new ColumnSet { Attributes = new[] { "new_domainid", "new_url" } },
                Attributes = new[] { "new_lead_domains" },
                Values = new object[] {  new Guid("662DBDAC-E737-DF11-8E3E-000C296EAD7C") }
            };
var domains = crm.RetrieveMultiple(query);