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Nonetheless, everything that is demonstrated in this tutorial is still relevant even if you decide to extend Table Adapters and build a separate BLL, or take some other approach.Note: We can still add queries or stored procedures to Table Adapters, which become methods we can call (via helper-methods), without having to explicitly extend a Table Adapter.

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That’s it, we are done with the USD Validations bit of it. Add("Type C") '---create a combobox column--- Dim combo Box Col As New Data Grid View Combo Box Column '---set the header--- combo Box Col. Header Text = "Types" '---add items to it--- combo Box Col. MSDN links: How to: Extend the Functionality of a Dataset How to: Extend the Functionality of a Table Adapter Validating Data in Datasets Walkthrough: Adding Validation to a Dataset Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms Data Grid View Control The following tutorials are for ASP. Creating a Data Access Layer Creating a Business Logic Layer These concentrate on extending the Table Adapters.The second link creates an entirely new BLL (Business Logic Layer) to sit between the Presentation and Data Access Layers.When it comes to object-oriented programming, too many C# books resort to whimsical but useless metaphors, like illustrating objects by creating animal classes such as mammals, cats, and dogs.


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