create barcode bitmap c# Part II in Visual C#

Creator Quick Response Code in Visual C# Part II

Part II
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ASP.NET Pages and Server Controls
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The resulting page header looks like this:
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<head> <title></title> <style type="text/css"> DIV#MyArea { color:Blue;background-color:LightGrey; } </style> </head>
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The RegisterStyle method allows registered page-wide Style objects to be merged programmatically with the style object of individual server controls. You register a new control-focused style as shown here:
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var labelStyle = new Style { ... }; ... Page.Header.StyleSheet.RegisterStyle(labelStyle, null); // Right after registering the style, you apply it to or merge it with multiple controls Label1.ApplyStyle(labelStyle); Label2.MergeStyle(labelStyle);
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Suppose now your page includes the following controls:
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<asp:Label runat="server" ID="Label1" Text="Hello, world" /> <br /> <asp:Label runat="server" ID="Label2" CssClass="bold" Text="Hello, world (merged)" />
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Here s the markup generated for the two Label controls:
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<span id="MainContent_Label1" class="aspnet_s0">Hello, world</span> <br /> <span id="MainContent_Label2" class="bold aspnet_s0">Hello, world</span>
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The class attribute of the first control is set to an autogenerated CSS class; the class attribute of the second control is the result of merging the current style with the new one.
Linking External CSS Files
To link an external style sheet file, you use the following code:
var link = new HtmlLink {Href = "~/StyleSheet.css"}; link.Attributes.Add("rel", "stylesheet"); link.Attributes.Add("type", "text/css"); Page.Header.Controls.Add(link);
The HtmlLink control represents an individual <link> element. The <link> tag can appear only in the <head> section of a document, although it can appear any number of times.
6 ASP.NET Core Server Controls
Managing Meta Information
The HtmlMeta control is a helper object to allow programmatic control over the HTML <meta> element. Located within the <head> section, a <meta> tag contains some meta information about the rendered page. A <meta> element is characterized by a name and an associated value. You use Name property to specify the metadata property name, and the Content property to specify the associated value:
// Meta information providing some clue to search engines var meta1 = new HtmlMeta { Name = "keywords", Content = "Key terms that describe your page" }; Page.Header.Controls.Add(meta1);
You can use the Scheme property to define some content for the scheme attribute of the HTML <meta> tag to provide additional information to user agents on how to interpret the meta information. Finally, you use the HttpEquiv property instead of Name when you need to assign a value to the http-equiv attribute of the resulting HTML <meta> element. Important If your <head> section contains code blocks, you are not allowed to enter changes
to its structure, such as adding new controls for <meta> and <link> tags. If you do so, you ll get a run-time exception. A common reason to have code blocks in a server-side <head> tag is to resolve script URLs. Here s a common example:
<head runat="server"> <script src="<%= ResolveUrl("~/Scripts/jquery-1.4.2.min.js") %>" type="text/javascript"></script> </head>
This code just prevents you from programmatically adding new controls to the Header object. The workaround simply consists of moving the script tag away from the <head> block. A good place to move it could be the bottom of the page, which also would deliver better rendering performance for the page. The browser usually stops rendering when it encounters a <script> tag and resumes after the script is downloaded. By placing all the <script> tags at the bottom of the body, your page starts doing some graphic work sooner (at least if it is linked to large script files).
Navigating to a URL
The HtmlAnchor class is the programmatic way of accessing and configuring the <a> tag. With respect to the other container controls, the HtmlAnchor class provides a few extra properties, such as HRef, Name, Target, and Title. The HRef property sets the target of the hyperlink and can be used to navigate to the specified location. The Name property names a
Part II
ASP.NET Pages and Server Controls
section in the ASP.NET page that can be reached from anywhere on the same page through #-prefixed HRefs. The following code demonstrates a bookmarked anchor named MoreInfo:
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