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private static SqlConnection con = new SqlConnection( Properties.Settings.Default.DBConnectionString); public static DataTable GetPermissions(Level userLevel) { // Permissions isn't actually a table in the data source. // Instead, it's a view that combines the important information // from all three tables using a Join query. string selectPermissions = "SELECT * FROM Permissions WHERE LevelName=@LevelName"; SqlCommand cmd = new SqlCommand(selectPermissions, con); SqlParameter param = new SqlParameter("@LevelName", Enum.GetName(typeof(Level), userLevel)); cmd.Parameters.Add(param); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds, "Permissions"); return ds.Tables["Permissions"]; } } Finally, the SearchMenu() function recursively tunnels through the menu, hiding or disabling controls as indicated in the permissions table. public class MenuLockDown { public static void SearchMenu(ToolStripItemCollection items, DataTable dtPermissions) { DataRow[] rowMatch; foreach (ToolStripItem item in items) { // Skip separators and other controls ToolStripMenuItem mnuItem = item as ToolStripMenuItem; if (mnuItem != null) { // See if this menu item has a corresponding row. rowMatch = dtPermissions.Select("ControlName = '" + mnuItem.Name + "'"); // If it does, configure the menu item state accordingly. if (rowMatch.GetLength(0) > 0) { DBPermissions.State state; state = (DBPermissions.State)int.Parse( rowMatch[0]["State"].ToString());

One limitation in your current example is that there is no way to handle data that need to be formatted before they can be displayed. For example, the UnitCost is displayed in the form 1.9900 instead of the more appropriate currency string $1.99. Luckily, it s quite easy to change this detail. If the conversion you want to perform involves converting a number or date into an appropriate string representation, you can use an overloaded version of the ControlBindingsCollection.Add() that accepts a format string. For example, instead of using this code: txtUnitCost.DataBindings.Add("Text", products, "UnitCost"); Use this: txtUnitCost.DataBindings.Add("Text", products, "UnitCost", true, DataSourceUpdateMode.OnValidation, 0, "C"); There are several extra parameters at work here. The first new parameter (true) enables formatting. The next parameter specifies the default update mode, which applies changes to the bound object after validation is performed. This doesn t represent a change, but a value is required for this version of the Add() method. The following parameter (0) sets the value that s used if the bound field is null, and the final string sets the format (C for currency), which ensures the UnitCost field is displayed with a currency symbol and two decimal places (see Figure 8-11).

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Figure 8-11. Formatting numbers to strings You can learn about all the format strings that are available in the MSDN Help. However, Table 8-3 and Table 8-4 show some of the most common options you ll use for numeric and date values, respectively.

Figure 7-30. Selecting the backup from the list of available backups 4. If the backup contains more than one volume, you will be asked to select which volume you wish to open from a drop-down list, as shown in Figure 7-31.

Figure 8-1. A WinForm containing a pie shape This image is linked to the size of the form, so you must tell the form to redraw itself whenever the form is resized. You do this by attaching an event-handling function to the Resize event. In this function, you call the form s Invalidate method, which tells the form that it needs to redraw itself.

$1,234.50 Brackets indicate negative values: ($1,234.50). The currency sign is locale-specific. 1.234.50E+004 45.6% Depends on the number of decimal places you set. F3 formats values like 123.400. F0 formats values like 123.

M/d/yyyy (for example: 10/30/2005) dddd, MMMM dd, yyyy (for example: Monday, January 30, 2005) dddd, MMMM dd, yyyy HH:mm aa (for example: Monday, January 30, 2005 10:00 AM)

Note If you are running Windows Vista and have User Account Control running, you will be asked to give

Now let s look at a more complete WinForms example. Imagine you want to create a form to display the Tree type defined in the next code example (see Figure 8-2): // The tree type type 'a Tree = | Node of 'a Tree * 'a Tree | Leaf of 'a // The definition of the tree let tree = Node( Node( Leaf "one", Node(Leaf "two", Leaf "three")), Node( Node(Leaf "four", Leaf "five"), Leaf "six"))

Table 8-4. Time and Date Format Strings (Continued)

dddd, MMMM dd, yyyy HH:mm:ss aa (for example: Monday, January 30, 2005 10:00:23 AM) yyyy-MM-dd HH:mm:ss (for example: 2005-01-30 10:00:23) MMMM dd (for example: January 30) M/d/yyyy HH:mm:ss aa (depends on locale settings) (for example: 10/30/2002 10:00:23 AM)

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