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Template based-editing really shines if you need to bind to more interesting controls, such as lists. For example, you could change the previous example to make the TitleOfCourtesy field editable through a drop-down list. Here s the template you need, with the new details in bold: <EditItemTemplate> <b> <%# Eval("EmployeeID") %> <asp:DropDownList runat="server" ID="EditTitle" SelectedIndex='<%# GetSelectedTitle(Eval("TitleOfCourtesy")) %>' DataSource='<%# TitlesOfCourtesy %>' /> <%# Eval("TitleOfCourtesy") %> <%# Eval("FirstName") %> <%# Eval("LastName") %> </b> <hr /> <small><i> <%# Eval("Address") %><br /> <%# Eval("City") %>, <%# Eval("Country") %>, <%# Eval("PostalCode") %><br /> <%# Eval("HomePhone") %></i> <br /><br /> <asp:TextBox Text='<%# Bind("Notes") %>' runat="server" id="textBox" TextMode="MultiLine" Width="413px" /> </small> </EditItemTemplate> This template allows the user to pick a title of courtesy from a limited selection of possible titles. To create this list, you need to resort to a little trick setting the DropDownList.DataSource

with a data binding expression that points to a custom property. This custom property can then return a suitable data source with the available titles of courtesy. Here s the definition for the TitlesOfCourtesy property in the web-page class: protected string[] TitlesOfCourtesy { get { return new string[]{"Mr.", "Dr.", "Ms.", "Mrs."}; } }

This list of titles of courtesy is by no means complete. There are also Miss, Lord, Lady, Sir, None, and so on. For a real-world application the titles could come from a database table or configuration file.

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This step ensures that the drop-down list is populated, but it doesn t solve the related problem of making sure the right title is selected in the list for the current value. The best approach here is to bind the SelectedIndex to a custom method that takes the current title and returns the index of that value. In this example, the GetSelectedTitle() method performs this task. It takes a title as input and returns the index of the respective value in the array returned by TitlesOfCourtesy. protectedint GetSelectedTitle(object title) { return Array.IndexOf(TitlesOfCourtesy, title.ToString()); } This code searches the array using the static Array.IndexOf() method. Note that you must explicitly cast the title to a string. That s because the DataBinder.Eval() method returns an object, not a string, and that value is passed to the GetSelectedTitle() method. Figure 10-15 shows the drop-down list in action.

This expansion is often used when adding strings to a variable. If the variable is empty, you don t want to add a separator: $ $ > > > $ : var= for n in a b c d e f g do var="$var $n" done sa "$var" a b c d e f g: To prevent the leading space, you can use parameter expansion: $ var= $ for n in a b c d e f g > do > var="${var:+"$var "}$n" > done $ sa "$var" :a b c d e f g: That is a shorthand method of doing the following for each value of n: if [ -n "$var" ] then var="$var $n" else var=$n fi or: [ -n "$var" ] && var="$var $n" || var=$n

ues, all of which will be passed to the specified view. If no keyword arguments are necessary, this value can be left out of the tuple.

Unfortunately, this still doesn t complete the example. Now you have a list box that is populated in edit mode, with the correct item automatically selected. However, if you change the selection, the value isn t sent back to the data source. In this example, you could tackle the problem by using the Bind() method with the SelectedValue property, because the text in the control exactly corresponds to the text you want to commit to the record. However, sometimes life isn t as easy, because you need to translate the value into a different database representation. In this situation, the only option is to handle the RowUpdating event, find the list control in the current row, and extract the text. You can then dynamically add the extra parameter, as shown here: protected void gridEmployees_RowUpdating(object sender, GridViewUpdateEventArgs e) { // Get the reference to the list control. DropDownList title = (DropDownList) (gridEmployees.Rows[e.RowIndex].FindControl("EditTitle")); // Add it to the parameters. e.NewValues.Add("TitleOfCourtesy", title.Text); } This will now successfully update both the Notes field and the TitleOfCourtesy. As you can see, editable templates give you a great deal of power, but they often aren t quick to code.

To make an even more interesting EditItemTemplate, you could add validator controls to verify input values, as discussed in 4.

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