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It s all well and good to assemble a menu out of bits and pieces in response to specific events, but it s even more interesting if the information is drawn from an external source. The following example uses a database table that maps user levels to control access permissions. Depending on the user type, some options may be disabled or hidden entirely. The database uses three tables (see Figure 21-3). Controls lists the names of available controls in the user interface, Levels lists the supported user levels, and Controls_Levels specifies what controls are allowed for a given user level (using a special State field that indicates 0 for normal, 1 for hidden, and 2 for disabled). All controls are enabled by default, so the only records that need to be added to Controls_Levels are those that specifically hide or disable controls. In a full-blown application, there would probably also be a Users table that indicates what level each user has.

Drawing your own forms means that you take responsibility for the pixels that appear on the screen. This low-level approach might appeal to those F# users who believe that many controls that come with the WinForms library are not perfectly suited to displaying data structures or the results of functions and algorithms. However, be warned that this approach can be time-consuming, and your time is usually better spent looking for a graphics library that abstracts away some of the presentation logic. To draw a WinForm, you attach an event handler to the Paint event of the form or the control. This means that your function is called every time Windows requests the form to be drawn. The event argument that is passed into this function has a property called Graphics, which contains an instance of a class also called Graphics. This class has methods (such as DrawLine) that allow you to draw pixels on the form. The following example shows a simple form where you draw a pie on it: open System.Drawing open System.Windows.Forms let form = // create a new form setting the minimum size let temp = new Form(MinimumSize = new Size(96, 96))

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Figure 21-3. Tables mapping control access permissions In this example, the database is configured with the information for two user levels: User and Admin. The different menu structures these users will see are shown in Figure 21-4.

Figure 21-4. Different menu structures By pulling all the user permission logic out of the user interface and placing it in the database, it becomes very easy to write a small amount of generic code that automatically configures the user interface for the user who is currently logged on: // Get permissions for an Admin-level user. DataTable dtPermissions = DBPermissions.GetPermissions(DBPermissions.Level.Admin); // Update the menu with these permissions. MenuLockDown.SearchMenu(MainMenuStrip.Items, dtPermissions); The DBPermissions class uses a static GetPermissions() function that returns a table with all the security information for the specified user level. To remove the chance of error, it also uses an enumeration that defines the different levels of user access in the database. public class DBPermissions { public enum State { Normal = 0, Disabled = 1, Hidden = 2 } public enum Level { Admin, User }

The easiest place to restore a file or selected files is on the computer where you want the files restored. However, you can use the Windows Home Server Console from any of your home computers, and then just copy the files over to the computer where you want the files. Follow these steps to restore selected files: 1. Start the Windows Home Server Console. 2. On the Computers & Backup tab, double-click the computer for which you want to retrieve the backup, or click to highlight the computer, and then click the View Backups button above the list. 3. Work through the list of backups until you find the one you want to restore, and then click it. Next, click the Open button in the Restore or View Files section of the dialog box, as shown in Figure 7-30.

// repaint the form when it is resize temp.Resize.Add (fun _ -> temp.Invalidate()) // a brush to provide the shapes color let brush = new SolidBrush(Color.Red) temp.Paint.Add (fun e -> // calculate the width and height of the shape let width, height = temp.Width - 64, temp.Height - 64 // draw the required shape e.Graphics.FillPie (brush, 32, 32, width, height, 0, 290)) // return the form to the top level temp Application.Run(form) You can see the form that results from executing this code in Figure 8-1.

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