You can extend the functionality of typed datasets by writing code into the dataset's partial class file.

The code that defines typed datasets is regenerated when changes are made in the Dataset Designer or when changes are made during the running of any of the wizards that create or modify objects in the dataset; for example, the Data Source Configuration Wizard, and the TableAdapter wizards. To prevent your code from being deleted during regeneration of the dataset, add code to the dataset's partial class file. (Partial classes allow code for a specific class to be divided among multiple physical files. For more information, see Partial (Visual Basic) or partial (C# Reference).)

To create the dataset's partial class file and add validation code, double-click columns and tables, which result in the generation of ColumnChanging and RowChanging event handlers. For more information, see How to: Validate Data During Column Changes and How to: Validate Data During Row Changes.

To add code to a typed dataset's partial class file

See Also