COM + Programming with Visual Basic : The Authoritative by Scott Hillier

By Scott Hillier

This publication is designed to get the reader all started quick developing company functions with COM+. The 5 elements of the booklet surround realizing COM+ purposes, facts providers Layer, company companies Layer, consumer companies Layer, and the ultimate project.In the final part of the booklet, readers will placed all that they discovered within the earlier chapters to paintings by way of constructing the program. This software is meant as a whole studying program that makes use of some of the good points offered within the publication

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What happens if the username and password are wrong? What if the credit card isn’t valid? 64 Understanding COM+ Applications PART I If the username or password is incorrect, an error occurs (see improper user name or password). When authenticated, the system puts a cookie on the customer’s machine so future log in is unnecessary. • Alternate Path: Cookie Authentication If a customer has logged in previously, the installed cookie is used to authenticate her. • Exceptions Any improper login results in an error message and a return to the start page.

However, if you want the proxies directed to a different server, you can enter the name of the server in the Options tab. The MSDTC Tab The third tab on My Computer Properties, the MSDTC tab, gives you control over settings for the Microsoft Distributed Transaction Coordinator (MSDTC). The MSDTC is responsible for managing distributed transactions in COM+. Distributed transactions enable your COM+ systems to perform transactions across multiple components and multiple databases. 4 shows the MSDTC tab.

Dll that you created earlier. When you select this file, the object inside the Administering COM+ CHAPTER 2 51 DLL will be listed in the Add Components dialog. Click Next and then Finish to add the component to your application. You are now ready to call the component from Visual Basic. Step 12 Return to Visual Basic and start a new Standard EXE project. This project will be a front end to the component in COM+. Step 13 Open the references dialog for the new project by selecting References from the Project menu.

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