barcode scanner in .net core

barcode scanner in .net core

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Add a Label control and a user input control, such as a TextBox, CheckBox, or ListBox control. Set the Label.AccessKey property to the keyboard shortcut. Set the Label.Text property, and underline the key used as the keyboard shortcut. For example, if the label should have Username on it and the keyboard shortcut is Alt+U, you would set Label.Text to <u>U</u>sername . The HTML markup for underlining text is <u>. The browser will render the Label as Username , and users familiar with keyboard shortcuts will recognize the underline convention that indicates the associated keyboard shortcut. Set the Label.AssociatedControlID property to the ID of the label control to set focus to it when the user presses the keyboard shortcut.

Figure 4-2 shows how to associate user name and password Label controls with TextBox controls. Notice that Visual Studio automatically converts the <u> HTML markup tag to <u>. This process is known as HTML character entity reference replacement and is performed so that the angle brackets are not confused with actual HTML tags.

6. Click Post to post the phone book, and wait for the phone book to post. 7. Click Close, and then close PBA.

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Populating the Label control with data from an untrusted source can create cross-site scripting (XSS) vulnerabilities. This is true for many of the controls that contain a Text property. The data applied to the Text property of the control can contain HTML code and script that will be executed by the page. To prevent this, use the HttpUtility.HtmlEncode method or the Server.HtmlEncode method to encode the untrusted data prior to placing it in the Text property.

You can set the value of the label s Text property in two ways. As shown above, you can define the Text property. Alternatively, you can nest text between the opening and closing elements as follows.

using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;

1. Click Start, point to Administrative Tools, and click Connection Manager Administration Kit. 2. On the Welcome To The Connection Manager Administration Kit Wizard page, click Next. 3. On the Service Profile Selection page, ensure that New Profile is selected and then click Next. 4. On the Service And File Names page, type Dial-up to CorpNet in the Ser vice Name text box and DialCorp in the File Name text box, and then click Next.

You can also set the value of the Text property from code. If you change the Text property in code, the new value will override what is set on the page inside the designer. The following shows an example of this code.

Sample of Visual Basic Code Label1.Text = "Some Text" Sample of C# Code Label1.Text = "Some Text";

Use the Literal control when you want to add raw HTML to a page, without requiring ASP.NET to provide any additional processing. At first glance, the Literal control seems very similar to the Label control. However, Literal does not inherit from WebControl, as Label does. Additionally, the Literal control does not add any HTML elements to the webpage, whereas the Label is rendered as a <span> tag. This means that the Literal control does not have a style property, and you therefore cannot apply styles to its content. The Literal control is useful when you need to add text to the output of the page dynamically (from the server) but do not want to use a Label. If your text is static, you can simply add it to the markup of the page (you do not need a Label or a Literal control). The Literal control contains the Mode property, which is used to specify any particular handling of the content of the Text property. The modes available and their descriptions are shown in Table 4-2.

9. On the Phone Book Updates page, type iis1.example.com in the Connec tion Point Services Server text box, and then click Next.

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