vb.net code 39 generator open source The HtmlHead Control in .NET framework

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The HtmlHead Control
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The HtmlHead control belongs to the System.Web.UI.HtmlControls namespace. An instance of this control is automatically created if the page contains a <head> tag marked with the runat=server attribute. Note that this setting is the default when you add a new page to a Visual Studio 2005 Web project, as shown in the following snippet:
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<head runat="server"> <title>Untitled Page</title> </head>
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The header of the page is returned through the new Header property of the Page class. The property returns null if the <head> tag is missing or if it is present but lacks the runat attribute.
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Part I ASP.NET Essentials
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The control implements the IPageHeader interface, which consists of three collection properties Metadata, LinkedStylesheet, Stylesheet, and a string property Title. The Metadata property is a dictionary that collects all the desired child <meta> tags of the header:
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Header.Metadata.Add( CODE-LANGUAGE", C# );
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The code results in the following markup:
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<meta name="CODE-LANGUAGE content="C# />
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To express other common metadata such as Http-Equiv, you can resort to adding literal controls to the Controls collection of the header. Notice that you must explicitly cast the Header object to Control because the Header property is declared of type IPageHeader, which has no Controls property defined.
LiteralControl equiv; equiv = new LiteralControl ( <meta http-equiv= refresh content= 3 /> ) ((Control) Header).Controls.Add(equiv);
To link a stylesheet file, you use the following code:
Header.LinkedStyleSheets.Add( MyStyles.css );
Finally, the HtmlHead control features the Title property, through which you can retrieve and set the title of the page.
Header.Title = This is the title";
Note that this property returns the correct page title only if the <title> tag is correctly placed within the <head> tag. Some browsers are quite forgiving on this point and allow developers to define the title outside the header.
Cross-Page Postbacks
Implementing cross-page postbacks requires only a couple of steps. First you set the PostBackUrl property on buttons and server controls that can cause postback. When the PostBackUrl property is set, the ASP.NET runtime binds the corresponding HTML element to a new JavaScript function. Instead of our old acquaintance __doPostback, it uses the new WebForm_DoPostBackWithOptions function:
<form runat="server"> <asp:textbox runat="server id="Data /> <asp:button runat="server id="buttonPost" Text="Click PostBackUrl="~/target.aspx /> </form>
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1
Creating an ASP.NET 2.0 Application
The button declaration renders the following markup:
<input type="submit name="buttonPost id="buttonPost value="Click" onclick="javascript:WebForm_DoPostBackWithOptions( new WebForm_PostBackOptions("buttonPost", "", false, "", "target.aspx", false, false)) />
As a result, when the user clicks the button, the current form posts its content to the specified target page. What about the view state When the page contains a control that does cross-page posting, a new hidden field is created __PREVIOUSPAGE. The field contains the view state information to be used to serve the request. This view state information is transparently used in lieu of the original view state of the page being posted to. You use the PreviousPage property to reference the posting page and all of its controls. Here s a sample page that can access the content of the text box defined in the server form presented a moment ago:
<%@ page language="C# %> <script runat="server"> void Page_Load(object sender, EventArgs e) { if (PreviousPage == null) { Response.Write( Invoke me only through cross-page posting. ); Response.End(); return; } // Retrieves the data textbox TextBox txt = (TextBox) PreviousPage.FindControl( Data ); Response.Write( <b>You passed:</b> + txt.Text); } </script> <html> <head runat="server"> <title>Target page</title> </head> <body> </body> </html>
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Part I ASP.NET Essentials
Paging the Page
If you have ever played with ASP.NET mobile controls, you should know about pagination. Pagination is a mobile page s ability to automatically display the contents of a form in pages according to the characteristics of the target device. The individual page to display is composed by dividing the overall markup into blocks of approximately the same size. ASP.NET 2.0 comes with a new control named Pager that adds similar functionality to all server controls, including mobile controls. The pager is capable of paginating container controls based on their weight or the number of items to display per page. The Pager control also displays its own user interface to let you move around the pages. Figure 1-9 shows a page with 50 text boxes that a pager displays a few at a time.
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