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Specifies how LINQ to SQL will use this column when processing the optimistic concurrency (see section 81) By default, all mapped columns in the class will be used when evaluating the concurrency If you re using a timestamp or another technique to manage concurrency, use this parameter to optimize your update and delete methods This parameter takes an enumerated value with the following options: Always (default) Always check this column Never Never check this column WhenChanged Only check this column if the given property has changed..

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When you first open this report in Design view, the toolbox should appear in the lower left area of the screen. If you don t see the toolbox, choose the Toolbox command from the View 35

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The large window in the background is the report design window where you create the design of the report. This report is designed to display all the information about employees by department. You can see that the Design view for reports is similar to the Design view for forms. (For comparison, see Figure 2-14 on page 31.) Reports provide additional flexibility, allowing you to group items and to total them (either across or down). You can also define header and footer information for the entire report, for each page, and for each subgroup on the report.

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Using these attributes, we can map the Author class from our running example to the corresponding table. Every EntitySet collection requires an identifying property. In the case of Author, we ll use a Guid called ID. Instead of using the public property set method, we specify that we want to store the value directly in the private

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_ID field using the Storage parameter. For clarity, we indicate that the name of the column is ID using the Name parameter. In case we wanted to generate the database dynamically, we specify the DbType for the column as UniqueIdentifier NOT NULL. Perhaps the most critical parameter on this column is the IsPrimaryKey designation that is required for at least one property in each class. The final parameter of the ID column is CanBeNull, which indicates that a value is required for this property. If no value is supplied, a run-time exception will be thrown.

Microsoft Office Access 2003 Inside Out menu or click the Toolbox button on the toolbar You can click the title bar of the toolbox and drag it to another location In the lower right of Figure 2-17, you can see a window titled qryRptEmployees This is a field list containing all the fields from the tblEmployees table and related fields from the tblDepartments table that provide the data for this report You might see this list near the top of the report s Design view when you first open it If you don t see the field list, choose the Field List command from the View menu or click the Field List button on the toolbar You can move the field list by dragging its title bar After you place all the controls on a report, you might want to customize some of them.

Do this by opening the Properties window, which you can see in the lower center of Figure 2-17 To see the Properties window, choose the Properties command from the View menu or click the Properties button on the toolbar The Properties window always shows the property settings for the control selected in the Report window (The Properties window can also display the properties for the report or any section on the report) In the example shown in Figure 2-17, I clicked the text box named EmployeeNumber to select it If you click this text box and click the All tab or the Data tab in the Properties window, you can see in the Control Source property box that Access displays the EmployeeNumber field from the tblEmployees table as the input data for this control You can also specify complex formulas that calculate additional data for report controls.

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