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The System.Web.UI.WebControls and System.Web.UI.HtmlControls namespaces Server controls consist of HtmlControls and WebControls. Those controls that we have seen in our examples so far, <asp:label>, <asp:textbox>, <asp:button>, and so forth, are examples of Web (server) controls. Web controls are abstract, strongly typed objects, which do not necessarily reflect HTML syntax. For example, using a simple <asp:calendar> control in your page can automatically generate almost 150 lines of HTML for display in the browser. This can be a major time saver when developing complex pages. There are about 30 Web controls in the System.Web.UI.WebControls namespace so we won t list them all here. Table 8.1 lists a few that are worth knowing about. We ll take a closer look at some of these controls in the course of this chapter.
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Table 8.1 The System.Web.UI.WebControls namespace Use Provides a command button. Use its OnClick attribute to specify a click event handler, or wire up an event handler in the page s OnLoad method. Displays a calendar that allows the user to select a date. Can be used to allow the user to enter boolean (true/false) data. If selected, its Checked property is true. The CheckBox control can trigger postback to the server if its AutoPostBack property is true. Provides a multiple-selection checked list with an Items collection containing the members in the list. To determine if an item is checked, you can test its boolean Selected property. Provides a convenient way to generate a tabular display of data from a data source. The data can optionally be selected, sorted, paged, and so forth. By default, field names are displayed in the grid s column headers and values displayed as text labels. Displays data in a list according to a template. Provides a single-selection drop-down list. Displays text in a specific location on the page. Use its Text property to set the text to be displayed. Provides a single- or multiple-selection list. Provides a container for other controls. Can be used to allow the user to enter boolean (true/false) data. If selected, its Checked property is true. Only one radio button in a group can be checked. A radio button s group can be assigned using its GroupName property. Provides a single-selection checked list with an Items collection containing the members in the list. To determine which item is selected, you can test the boolean Selected property of the items. The Table control can be used to programmatically build a table by adding TableRow controls to the Rows collection of the table, TableCell controls to the Cells collection of any row, and controls to the Controls collection of any cell. Allows the user to enter text. Set its TextMode to MultiLine to enable multiple lines of text, or to Password to hide password characters.
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Unlike WebControls, HtmlControls such as HtmlAnchor and HtmlTable, typically have a one-to-one correspondence with an equivalent HTML tag. However, they offer a convenient model that allows you to manipulate them programmatically on the server side. The SDK documentation provides a complete list and, since they map so closely to the HTML elements they represent, we won t list them here. Instead, we ll explore an example of using the HtmlTable control to build a table later in this chapter. But first, we explore examples which use the Calendar and DataGrid Web server controls. 8.3.3 Using the Calendar Web control Listing 8.7 provides an example that uses the Calendar Web control to allow the user to select a date.
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Listing 8.7 Using the Calendar Web control
<!-- calform.aspx --> <%@ Page Language="C#" Debug="true" %> <script runat=server> private void dateHandler(object sender, EventArgs e) { myMessage.Text = "You selected " + myCalendar.SelectedDate.ToShortDateString(); } </script> <html><head><title>Calendar ASP.NET App</title></head> <body> <h1>Calendar ASP.NET Application</h1> <form runat="server"> <asp:calendar id="myCalendar" onSelectionChanged="dateHandler" Font-Name="Verdana" Font-Size="8pt" Font-Bold="true" BorderColor="black" BackColor="Gainsboro" runat="server" /> <p> <asp:Label id="myMessage" Font-Name="Verdana" Font-Size="8pt" Font-Bold="true" runat="server" /> </p> </form> </body> </html>
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