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To account for this sort of table relationship, the parent entity class may encode the child table as property references. This property is marked with the [Association] attribute to establish an association relationship made by matching column values between tables. For example, consider the (partially) generated code for the Customer type, which can have any number of orders: [Table(Name="Customers")] public partial class Customers : INotifyPropertyChanging, INotifyPropertyChanged { private EntitySet<Orders> _Orders; [Association(Name="FK_Orders_Customers", Storage="_Orders", OtherKey="CustID")] public EntitySet<Orders> Orders { get { return this._Orders; } set { this._Orders.Assign(value); } } ... } Here, the Orders property is understood by the LINQ to SQL runtime engine as the member that allows navigation from the Customers table to the Orders table via the column defined by the OtherKey named property. The EntitySet<T> member variable is used to represent the one-tomany nature of this particular relationship. Likewise, if you examine the generated code for the Orders type, you will see a converse relationship between the child and parent tables, using the EntityRef<T> member variable and the ThisKey named property of the [Association] attribute.

The final aspect of the sqlmetal.exe-generated code to be aware of is the DataContext-derived type. Like the CarsDatabase class we authored in the previous example, each table is represented by a Table<T> member variable. As well, this class has a series of constructors, one of which takes an object implementing IDbConnection, which represents an ADO.NET connection object (remember, LINQ to SQL and ADO.NET can be intermixed within a single application). As well, this DataContext-derived class is how we are able to interact with the stored procedures defined by the database. Given the fact that we supplied the /sprocs flag as part of our sqlmetal.exe command set, we find a method named (of course) GetPetName(). Here is the complete definition of our custom DataContext: public partial class Cars : DataContext { public Table<Customers> Customers; public Table<Inventory> Inventory; public Table<Orders> Orders; public Cars(string connection) : base(connection) {} public Cars(IDbConnection connection) : base(connection) {} public Cars(string connection, MappingSource mappingSource) : base(connection, mappingSource) {} public Cars(IDbConnection connection, MappingSource mappingSource) : base(connection, mappingSource) {} [StoredProcedure(Name="GetPetName")] public int GetPetName( [Parameter(DBType="Int")] System.Nullable<int> carID,

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6. Click OK to close the Add Watch dialog box. 7. If not already open, open the Watch window in the VBE by clicking View Watch Window. Figure 7-36 shows the Watch window with our expression added.

With the aural CSS properties, you should be able to control the pitch, speed, tone, and other attributes for speech-synthesized versions of the web page to great effect, but support for this is very much lacking. To date, we ve only seen (or rather heard) one good application of this: a plugin for Firefox called Firevox, which is definitely worth downloading (http://firevox.mozdev.org/ installation.html) and checking out to see what should be possible with this technology. You can find out more about the various CSS aural properties and values at the W3C (www.w3.org/ TR/REC-CSS2/aural.html), or for a simpler example try the W3Schools introduction to this topic (www.w3schools.com/css/css_ref_aural.asp).

[Parameter(DBType="Char(20)")] ref string petName) { StoredProcedureResult result = this.ExecuteStoredProcedure(((MethodInfo)(MethodInfo.GetCurrentMethod())), carID, petName); petName = ((string)(result.GetParameterValue(1))); return result.ReturnValue.Value; } } Notice that the GetPetName() method is marked with the [StoredProccedure] attribute, while each parameter is marked with the [Parameter] attribute. The implementation makes use of the inherited ExecuteStoredProcedure() method to take care of the details of invoking the stored procedure and returning the result to the caller.

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