// Execute Multiple Operations in a Transaction

using (var service = new OrganizationServiceProxy(serviceUri, null, credentials, null))

{

    using (var txnScope = new TransactionScope())

    {

        var createRequest = new CreateRequest { Target = new Entity("account") { ["name"] = "New Account" } };

        var updateRequest = new UpdateRequest { Target = new Entity("contact", contactId) { ["lastname"] = "Updated Name" } };

        service.Execute(createRequest);

        service.Execute(updateRequest);

​

        txnScope.Complete(); // Commit transaction

    }

}