B.1 codegen Namespace The codegen namespace gives you fine-grained control of a typed DataSet . By adding codegen attributes, you can configure the names that are used for methods , properties, relations, and constraints. When using the codegen namespace, it should be imported as shown: <xs:schema id="DataSetName" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:codegen="urn:schemas-microsoft-com:xml-msprop" > | | codegen attributes configure the names used in strongly typed DataSet objects. They do not have any effect on the functionality of the generated DataSet class. | | Table B-1 indicates where the various codegen attributes can be used and what they accomplish. Table B-2 briefly describes each attribute. Table B-1. codegen attribute use | Typed DataSet object/method/event | Default name | codegen attribute | | DataTable | TableNameDataTable | typedPlural | | DataTable Methods | NewTableNameRow AddTableNameRow DeleteTableNameRow | typedName | | DataRowCollection | TableName | typedPlural | | DataRow | TableNameRow | typedName | | DataColumn | DataTable.ColumnNameColumn DataRow.ColumnName | typedName | | Property | PropertyName | typedName | | Child Accessor | GetChildTableNameRows | typedChildren | | Parent Accessor | TableNameRow | typedParent | | DataSet Events | TableNameRowChangeEvent TableNameRowChangeEventHandler | typedName | Table B-2. codegen atttributes | Attribute | Description | | typedName | Name of the object in the generated class. | | typedPlural | The name of the object in a collection of objects. For example, if you specify Category for typedName and Categories for typedPlural , you generate a Categories collection and a Category row (instead of a CategoriesRow ). | | typedParent | Name of the object when referred to in a parent relationship. Typed datasets automatically generate methods that provide access to parent and child rows. For example, if you specify Category for the typedParent of an order record, use a Order.Category( ) method instead of Order.GetCategoriesRow( ) . | | typedChildren | Name of the method to return objects from a child relationship. For example, if you specify Order for the typedChild of a category record, use a Category.Orders( ) method instead of Category.GetOrdersRows( ) . | | nullValue | Indicates the behavior when null values are encountered . See Table B-3 for possible values. | Finally, Table B-3 identifies possible values for the nullValue attribute. Table B-3. Values for nullValue | Value | Description | | [Replacement Value] | Specifies a value to be returned. For example, use nullValue="0" to set null integer fields to 0. | | _throw | Throws an exception when a null value is encountered. This is the default. | | _null | Returns a null reference (or throws an exception if a primitive type is encountered). | | _empty | For strings, returns String.Empty . For objects, returns the default uninitialized object (created from the zero-parameter constructor). If a primitive type is encountered, ADO.NET generates an exception. | |