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// Create a color from an OLE color code. ctrl.ForeColor = ColorTranslator.FromOle(0xFF00); // Create a color from a Win32 color code. ctrl.ForeColor = ColorTranslator.FromWin32(0xA000); The next code snippet shows how you can transform the KnownColors enumeration into an array of strings that represent color names. This can be useful if you need to display a list of valid colors by name in an application. string[] colorNames; colorNames = System.Enum.GetNames(typeof(KnownColor)); Changing a color-name string back to the appropriate enumerated value is just as easy using the special static Enum.Parse() method. This method compares the string against all the available values in an enumeration, and chooses the matching one. KnownColor myColor; myColor = (KnownColor)Enum.Parse(typeOf(KnownColor), colorName); // For example, if colorName is "Azure" then MyColor will be set // to the enumerated value KnownColor.Azure (which is also the integer value 32). Incidentally, you can use a few useful methods on any Color structure to retrieve additional color information. For example, you can use GetBrightness(), GetHue(), and GetSaturation(). Here s a complete program that puts all of these techniques to work. When it loads, it fills a list control with all the known colors. When the user selects an item, the background of the form is adjusted accordingly (see Figure 2-5). The only exception is the Transparent color, which generates an exception. (See 3 to learn how to create a truly transparent form.) public partial class ColorChange : System.Windows.Forms.Form { // (Windows designer code omitted.) private void ColorChange_Load(object sender, System.EventArgs e) { string[] colorNames; colorNames = System.Enum.GetNames(typeof(KnownColor)); lstColors.Items.AddRange(colorNames); } private void lstColors_SelectedIndexChanged(object sender, System.EventArgs e) { KnownColor selectedColor; selectedColor = (KnownColor)System.Enum.Parse( typeof(KnownColor), lstColors.Text); this.BackColor = System.Drawing.Color.FromKnownColor(selectedColor);

This will show, in reproducible GRANT statements, the privileges available to the user (helpful in reminding you of the syntax for the GRANT statement). Listing 15-2 shows the output of SHOW GRANTS. Listing 15-2. SHOWS GRANTS Output mysql> SHOW GRANTS FOR 'jpipes'@'localhost'; +------------------------------------------------------------------------+ | Grants for jpipes@localhost | +------------------------------------------------------------------------+ | GRANT SELECT, INSERT, UPDATE, DELETE ON *.* TO 'jpipes'@'localhost' | | GRANT SELECT ON `ToyStore`.* TO 'jpipes'@'localhost' | | GRANT EXECUTE ON `test`.`ShowIndexSelectivity` TO 'jpipes'@'localhost' | +------------------------------------------------------------------------+ 3 rows in set (0.00 sec) You may notice a peculiarity in the results in Listing 15-2. The privileges for jpipes@localhost on a global level completely negate the need for the SELECT privilege on the ToyStore database. So, why do both lines appear This is because MySQL does not remove grant table entries just because a more encompassing privilege level has been granted to the user. Keep this in mind when changing user privileges. If at some point, you loosen a user s restrictions by granting global privileges, and later revoke the global privileges, the databasespecific privileges will still exist.

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Nonpersistent cross-site scripting (XSS) is a type of attack that targets web-based applications that send data from one webpage to another via form POST or through the query string segment of the URL of a requested web page. For instance, consider a web page that generates a list of products for display, each product represented by a harmless-looking link:

// Display color information. lblBrightness.Text = "Brightness = " + this.BackColor.GetBrightness().ToString(); lblHue.Text = "Hue = " + this.BackColor.GetHue().ToString(); lblSaturation.Text = "Saturation = " + this.BackColor.GetSaturation().ToString(); } }

Another option for determining a user s privileges involves querying the actual grant tables (which are described in the next section). To see global permissions for jpipes@localhost, query the user grant table, as Listing 15-3 demonstrates. Listing 15-3. Querying the user Grant Table Directly mysql> SELECT * FROM mysql.user -> WHERE User = 'jpipes' AND Host = 'localhost' \G *************************** 1. row *************************** Host: localhost User: jpipes Password: Select_priv: Y Insert_priv: Y Update_priv: Y Delete_priv: Y Create_priv: N Drop_priv: N Reload_priv: N Shutdown_priv: N Process_priv: N File_priv: N

Note ForeColor and BackColor are ambient properties properties that, if not set, are retrieved from the

Let s assume that the viewproduct.aspx.vb page contained the following code:

parent. For example, if you add a Label to a Form and don t set the BackColor, the Label uses the BackColor of the Form. If you add a Label to a Panel and don t set the BackColor, the Label uses the BackColor or the Panel (and if that isn t set, the Panel uses the BackColor of the Form). Other ambient properties include Font and Cursor.

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