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Download ADO.NET and ADO Examples and Best Practices for VB by William R. Vaughn PDF

By William R. Vaughn

ADO.NET and ADO Examples and top Practices for VB Programmers, moment Edition brings the preferred first variation brand new with clean insights and tips about COM-based ADOand provides a voluminous part at the new ADO.NET expertise. Written particularly for COM-based ADO builders retooling for ADO.NET, this can be a developer's ebook, full of sensible recommendation on find out how to make code run quicker, but be more straightforward to put in writing and understand.

Veteran writer William Vaughn publications you thru the information entry maze with working examples and various discussions of what works and what does not. Derived from years of expertise operating with information entry builders, Vaughn's Best Practices are a suite of recommendations confirmed to vastly decrease overhead, difficulties, and confusion—for the developer, the method, and the complete workforce. whereas a few are very simple to enforce, others require enormous wisdom and forethought to enable.

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This chapter discusses why, when, and how to use ADO Connection objects to get connected. Although these objects won't help your social life, they will help you get in touch with your data. Frankly, based on the number of questions generated in my classes and the length of time the connection labs consume, getting connected (to databases) seems to be quite daunting for some people--and not just for those getting started with ADO. For example, there seems to be quite a bit of confusion regarding the ConnectionString property and how to construct it correctly (and efficiently).

In this case, place your UDL file outside of the /inetpub/ directory. MapPath won't help because it returns a directory relative to the virtual directory and you want to keep your common files outside of the virtual directory. Connecting to ,,Local" SQL Servers In some cases, especially when working with MSDE, you want to open whichever SQL Server is locally installed. ) as the Data Source argument in the ConnectionString. 0. To refer to the local instance, you have to be more specific; for example, my SQL Server 2000 instance is named "SS2K", so ".

Just keep in mind that ADO objects (like all COM objects) take time to instantiate and additional time to tear down. NET promises to fix this problem), it's pretty expensive to create unnecessary ADO objects. Yes, you can use the ODBC API to decrease the time it takes to get your components started and destroyed. If you're thinking about bypassing ADO and using OLE DB directly, forget it. You can't use OLE DB from Visual Basic-despite its performance benefits over ADO. When Things Go Wrong Okay, so your code works correctly on your development machine, but after you package up your application and deploy it to your boss's computer you get an error indicating that Visual Basic could not resolve a COM reference.

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