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Like Windows as a whole, NTFS is fully Unicode enabled, using Unicode characters to store names of files, directories, and volumes. Unicode, a 16-bit character-coding scheme, allows each character in each of the world s major languages to be uniquely represented, which aids in moving data easily from one country to another. Unicode is an improvement over the traditional representation of international characters using a double-byte coding scheme that stores some characters in 8 bits and others in 16 bits, a technique that requires loading various code pages to establish the available characters. Because Unicode has a unique representation for each character, it doesn t depend on which code page is loaded. Each directory and file name in a path can be as many as 255 characters long and can contain Unicode characters, embedded spaces, and multiple periods.

And code in the form s Current event prevents the user from clicking on the button when on a new record that doesn t have a contact ID, as shown below.

Private Sub Form_Current() Disable "edit this" if on a new row Me.cmdEdit.Enabled = Not (Me.NewRecord) End Sub

Column Attribute Typically, the most frequently used attribute is the Column attribute. This attribute maps the columns in the database to the class properties. In mapping a column to a property with the same name, we can get away with decorating the property with the Column attribute without specifying any parameter values. In many cases, we ll want to specify some of the parameters in table 7.2 to add functionality to the mappings.

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Now let s take a look at using the Filter technique to link to related information in a report. Open the frmInvoices form in the LawTrack Contacts application (Contacts.mdb) and move to an invoice that looks interesting. Click the Print button to open the Print Invoices form (fdlgInvoicePrintOptions) that gives you the option to see the current invoice formatted in a report, display all unprinted invoices in a report, display only unprinted invoices for the current customer, or print all invoices currently shown in the frmInvoices form. (You can use Search to filter the displayed invoices to the ones you want.) Choose the Current Invoice Only option and click Print again to see the invoice in a report, as shown in Figure 23-22 on the next page. 903

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Table 7.2 Listing of parameters used by the Column attribute Description Enumerated value indicating how LINQ to SQL should handle database columns that change as the result of a Create or Update method. This is particularly useful for columns with default values. The valid options are Default, Always, Never, OnInsert, and OnUpdate. Indicates if the database column can be null. Remember, a null is not the same as an empty string.

Setting the button s Enabled property to False causes it to appear dimmed, and the user cannot click the button.

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Listing of parameters used by the Column attribute (continued) Description This attribute is used to specify the database type used when creating a column with the DataContextCreateDatabase method A valid example would be NVarChar(50) Not Null Default('') This value is only used when generating databases with the CreateDatabase method The value included here is the SQL string specifying how to create a calculated field in the database Used to indicate if the database generates the value for this property This parameter should be used for Identity or AutoNumber columns in the database The value will be populated in your class immediately after the record is updated in the database via the SubmitChanges method Use this to designate that the column in question identifies a specific instance type to be used for the given row We ll see this in action in section 833.

Microsoft Office Access 2003 Inside Out (The figure shows you the sequence you see after clicking the Print button on the frmInvoices form. The Print Invoices dialog box closes after opening the report.)

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The code from the Click event of the Print button in the fdlgInvoicePrintOptions form is as follows:

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