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Microsoft Office Access 2003 Inside Out This procedure executes whenever the user sets any value on a new row in the subform. First, it makes sure that the outer form has a valid ContactID. Next, the code uses the DLookup domain function to attempt to fetch the default company ID for the current contact. The query includes a filter to return only the rows from tblCompanyContacts where the DefaultForContact field is True. If the function returns a valid value, the code sets the required CompanyID field automatically. If it can t find a CompanyID, the code uses the MsgBox statement to tell the user about the error. Note The IsNothing function that you see used in code throughout all the sample applications is not a built-in Visual Basic function. This function tests the value you pass to it for nothing Null, zero, or a zero-length string. You can find this function in the modUtility standard module in all the sample databases.

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We will not detail here how this code works. You will see documented examples like this one in parts 3 and 4 of the book. What is important to note at this point is how LINQ makes it easy to work with relational data and XML in the same piece of code. If you have already done this kind of work before, it should be obvious that this code is very concise and readable in comparison to the solutions at your disposal before LINQ appeared. Before seeing more code samples and helping you write your own LINQ code, we ll now quickly review where LINQ comes from.

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It s important to know clearly what Microsoft set out to achieve with LINQ. This is why we ll start this section by reviewing the design goals of the LINQ project. It s also interesting to know where LINQ takes its roots from and understand the links with other projects you may have heard of. We ll spend some time looking at the history of the LINQ project to know how it was born. LINQ is not a recent project from Microsoft in the sense that it inherits a lot of features from research and development work done over the last several years.

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Microsoft Office Access 2003 Inside Out window always shows the property values for the control selected in the Form window (The Properties window can also display the properties for the form or any section on the form) Click the All tab in the Properties window to display all the properties in a single list, or display subsets of the available properties by clicking Format, Data, Event, or Other In the example shown in Figure 2-14, I clicked the text box named EmployeeNumber, near the top of the form, to select it As you might guess, you can use a text box control to display text as well as to input text into the database.

If you click this text box and select the All tab in the Properties window, you can scroll down the list of properties for this text box and see the wide range of properties you can set to customize this control As you learn to build applications using Access, you ll soon discover that you can customize the way your application works by simply setting form and control properties you don t have to write any code If you scroll to the bottom of the property list, or click the Event tab, you ll see a number of properties that you can set to define the macros or Visual Basic procedures that Access runs whenever the associated event occurs on this control For example, you can use the Before Update event property to perform additional validation before Access saves any changes typed in this control.

The final piece in the Windows networking architecture puzzle is the way in which the components at the various layers networking API layer, transport driver layer, NDIS driver layer locate one another. The name of the process that connects the layers is binding. You ve witnessed binding taking place if you ve changed your network configuration by adding or removing a component using the Network Connections folder. When you install a networking component, you must supply an INF file for the component. (INF files are described in 7.) This file includes directions that setup API routines must follow to install and configure the component, including binding dependencies or binding relationships. A developer can specify binding dependencies for a proprietary component so that the Service Control Manager (the Service Control Manager is described in 4) will not only load the component in the correct order but will load the component only if other components the proprietary component depends on are present on the system. Binding relationships, which the bind engine determines with the aid of additional information in a component s INF file, establish

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