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Table 1.1 LINQ s design goals and the motivations behind them Goal Integrate objects, relational data, and XML Motivation Unified query syntax across data sources to avoid different languages for different data sources. Single model for processing all types of data regardless of source or in-memory representation. Integrate querying abilities right into the programming languages. Enable implementation for other programming languages. Be able to access other data sources than relational databases or XML documents. Allow other frameworks to enable LINQ support for their own needs. Compile-time type checking to avoid problems that were previously discovered at run-time only. The compiler will catch errors in your queries. Assist developers when writing queries to improve productivity and to help them get up to speed with the new syntax. The editor will guide you when writing queries. Allow developers to debug LINQ queries step by step and with rich debugging information. Reuse the rich features that have been implemented in the previous versions of the languages. Avoid requiring a new runtime and creating unnecessary deployment hassles. Be able to use standard and generic collections, data binding, existing web and Windows Forms controls, and so on.

<function name>(<field expression>, <domain name> [, <criteria> ])

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where <function name> is the name of one of the functions listed above <field expression> is a string literal or name of a string variable containing the name of a field or an expression using fields from the specified domain <domain name> is a string literal or name of a string variable containing the name of a table or query in your database <criteria> is a string literal or name of a string variable containing a Boolean comparison expression to filter the records in the domain Note that when a domain function finds no records, the returned value is a Null, so you should always assign the result to a Variant data type variable. When you construct a criteria expression, you must enclose string literals in quotes and date/time literals in the # character. (If you use double quotes to delimit the criteria string literal, then use single quotes around literals inside the string, and vice versa.) For example, to find the lowest work postal code value for all contacts where contact type is customer and the birth date is before January 1, 1970, enter:

DMin("WorkPostalCode", "tblContacts", "[ContactType] = customer And [BirthDate] < #01/01/1970#")

In almost every data entry form you ll ever build, you ll need to provide a way for the user to set the foreign key of the edited record on the many side of a relationship to point back to the correct one side record for example, to set the ProductID field in the tblContactProducts table when selling a product on the Products tab of the frmContacts form. But what if the user needs to create a new product Should the user have to open the form to edit products first to create the new product before selling it The answer is a resounding no, but you must write code in the NotInList event of the combo box to handle new values and provide a way to create new rows in the tblProducts table. Figure 23-3 on the next page shows you what happens when the user tries to type a product name that s not already in the tblProducts table. In this case, the customer wants to purchase a two-year support contract instead of the already available one-year product. You can see that something has intercepted the new product name to confirm that the user wants to add the new product.

Notice this time, since we already assigned the Base Class Discriminator, Discriminator Property, and Inheritance Default, these values are retained. All we need to do is set the Derived Class Code. Since we want AuthorUsers loaded when the type is A, enter the value A. With the inheritance mappings set, save the changes to the designer. Viewing the generated code in the .designer.cs file shows the attributes that were added to your class definition.

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connections between components at the various layers. The connections specify which components a network component on one layer can use on the layer beneath it. For example, the Workstation service (redirector) will automatically bind to the TCP/IP protocol. The order of the binding, which you can examine on the Adapters And Bindings tab in the Advanced Settings dialog box, shown in Figure 12-32, determines the priority of the binding. (See the section Multiple Redirector Support earlier in this chapter for instructions on how to launch the Advanced Settings dialog box.) When the redirector receives a request to access a remote file, it submits the request to both protocol drivers simultaneously. When the response comes, the redirector waits until it has also received responses from any higherpriority protocol drivers. Only then will the redirector return the result to the caller. Thus, it can be advantageous to reorder bindings so that bindings of high priority are also the most performance efficient or applicable to most of the computers in your network. You can also manually remove bindings with the Advanced Settings dialog box.

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[InheritanceMapping(Code="S", Type=typeof(UserBase), IsDefault=true)] [InheritanceMapping(Code="A", Type=typeof(AuthorUser))] [InheritanceMapping(Code="P", Type=typeof(PublisherUser))] [Table(Name="dbo.[User]")] Public partial class UserBase { //Implementation code omitted }

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