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The function Update Data Set can accept as input an array of tables and their corresponding data adapters, perform all requested CRUD operations and return the dataset with rows having 'as expected' row state and version for merging back to client's datasets.

It is important that the data adapters and the data tables will be passed to Update Data Set function with a specific order, because when relations exists in the dataset and in database, the CRUD operations must be applied in the correct order.

The system needs to let the user modify some rows, or maybe delete another rows, or just add new rows, and at the end, or when ever they wants, they can click on the save button. Allows to update a data base, from a data table that has been modified, deleted rows, and add rows?

But each thing will happen, before the data is stored in the database. We have a list of books wrote on the paper, and we want to add a couple of books more, but later we discovered that one book is not needed, and 2 seconds later, we see that the name of a book, is wrong, spell mistakes.

And sure enough, when you go to Server Explorer and browse to the rows that should have been changed in the first run you can see that the data is unchanged.

That's because, when you press F5, Visual Studio quietly copies your database from your project's root folder to the bin/Debug folder, and that's the version of the database that your code updates.

When you think about it, this is a good idea: Individual test runs leave your test data unchanged.

For example, when we have two tables, Parent Table and Child Table, the data Tables array must contain then in this order Child Table, Parent Table with the same order for their data adapters in data Adapters array.

The philosophy behind the code is this: When the data adapters in the DAL do an update on dataset, they force an Accept Changes on all rows of all tables.

When a row was inserted in the dataset from the client side, the dataset detects identity columns an assign them virtual identity values.

Probably everyone in the world but me knows how Visual Studio handles database files during testing in a GUI-based project. NET projects, I didn't clue into this behavior until recently.

But even if you do know about this "feature," you may not be aware of how you can improve on Visual Studio's default behavior.




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