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You can handle this problem in a few ways. (Earlier, you saw an example in which the enumeration integer was stored as a value in the list control.) In this case, the most direct approach involves using an advanced feature called a TypeConverter. A TypeConverter is a special class that is able to convert from a specialized type (in this case, the BorderStyle enumeration) to a simpler type (such as a string), and vice versa. To access this class, you need to import the System.ComponentModel namespace: Imports System.ComponentModel You can then add the following code to the cmdUpdate_Click event handler: ' Find the appropriate TypeConverter for the BorderStyle enumeration. Dim cnvrt As TypeConverter converter = TypeDescriptor.GetConverter(GetType(BorderStyle)) ' Update the border style using the value from the converter. pnlCard.BorderStyle = converter.ConvertFromString(lstBorder.SelectedItem.Text) This code gets the appropriate TypeConverter (in this case, one that s designed expressly to work with the BorderStyle enumeration). It then converts the text name (such as Solid) to the appropriate value (BorderStyle.Solid).

Excel can change cells display formats, such as shading or font colors, if specified conditions are met. This technique is known as conditional formatting. For example, you could shade a cell green if its value is greater than 100, or you could shade a cell red if its value is less than zero. To apply, change, or remove conditional cell formatting, follow these steps: 1. Select the cells for which you want to add, change, or remove conditional cell formatting. 2. Click Format Conditional Formatting. 3. Do one of the following: To add a conditional cell format, follow these steps: a. Select Cell Value Is or Formula Is, select the comparison phrase, and then type a value; or type a formula that can return the value True, starting with an equal sign (=). b. Click Format. c. Select the formatting that you want to apply when the cell value meets the condition or the formula returns the value True. d. To add another condition, click Add, and then repeat the previous three steps. To change a conditional cell format, click Format for the condition that you want to change, select any options that you want to change, and then click OK. To remove one or more conditional cell formats, click Delete, select the check boxes for the conditions that you want to delete, and then click OK. 4. Click OK.

The last step is to use ASP.NET s automatic postback events to make the card update dynamically every time an option is changed. The Update button could now be used to submit the final, perfected greeting card, which might then be e-mailed to a recipient or stored in a database. To configure the controls so they automatically trigger a page postback, simply set the AutoPostBack property of each input control to True. An example is shown here: Choose a background color:<br /> <asp:DropDownList ID="lstBackColor" AutoPostBack="True" runat="server" Width="194px" Height="22px"/> Next, you need to create an event handler that can handle the change events. To save a few steps, you can use the same event handler for all the input controls. All the event handler needs to do is call the update routine that regenerates the greeting card. Protected Sub ControlChanged(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles lstBackColor.SelectedIndexChanged, chkPicture.CheckedChanged, _ txtFontSize.TextChanged, lstBorder.SelectedIndexChanged, _ lstFontName.SelectedIndexChanged, lstForeColor.SelectedIndexChanged, _ txtGreeting.TextChanged ' Refresh the greeting card (because a control was changed). UpdateCard() End Sub

Protected Sub cmdUpdate_Click(sender As Object, e As EventArgs) _ Handles cmdUpdate.Click ' Refresh the greeting card (because the button was clicked). UpdateCard() End Sub Private Sub UpdateCard() ' (The code that draws the greeting card goes here.) End Sub With these changes, it s easy to perfect the more extensive card-generating program shown in Figure 6-18. The full code for this application is provided with the online samples.

A string or array pointing to another site or location in the application. The HTTP status code, if desired (for example, 404 or 500 error codes). If true, the PHP exit() function will be called after the redirect.

Tip Automatic postback isn t always best. Sometimes an automatic postback can annoy a user, especially

when the user is working over a slow connection or when the server needs to perform a time-consuming option. For that reason, it s sometimes best to use an explicit submit button and not enable AutoPostBack for most input controls. Alternatively, you might jazz up your web page with the ASP.NET AJAX features described in 25, which allow you to create user interfaces that feel more responsive, and can update themselves without a distracting full-page refresh.