barcode scanner in .net core

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A server control is a control that you can program by writing server-side code to respond to events from the control. Server controls contain the runat="server" attribute and must exist within a form that has the same runat attribute. The Label control displays text at a specific location on the webpage by using the properties that have been assigned to the Label control. The Literal control returns text without any additional processing and is useful when you need to return raw HTML. The TextBox control collects text from the user.

There are cases in which you can t use managed code. For instance, many native Win32 functions require pointers. One of the problems C/C++ programmers often had with Visual Basic was the lack of pointers. Visual Basic .NET still doesn t support pointers, but it does support a similar mechanism called a reference type. Still, in some cases, pointers can come in handy. You might also need to access unmanaged legacy code. In the best of all worlds, all our programs would magically be converted to managed code because of the advantages it offers, but sometimes this isn t possible. So what about the times when you really need a pointer or need to access legacy code For these situations, C# provides a special keyword: unsafe. A method or a section of code can be declared as unsafe, and when compiled using the /unsafe compiler switch, will generate unsafe (unmanaged) code that isn t verifiable by the runtime. In addition to unsafe, C# provides the fixed keyword. During the process of garbage collection, variables are often moved to make more efficient use of memory. If several smaller blocks of free memory are required for a single, larger allocation, the garbage collector can move the blocks to make the single larger block available. Such rearranging would obviously be disastrous for any program that had stored, within unsafe code, a pointer to one of the variables the garbage collector moved. The fixed keyword was added for just this situation. Within a fixed block, the variables referenced will be pinned and won t be movable. After exiting the fixed block, the variables are once again available for the garbage collector to move as required.

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The CheckBox control prompts the user to select or clear a check box to choose true or false. The RadioButton control prompts the user to select between mutually exclusive RadioButton controls in a group. The DropDownList control prompts the user to select one of many different options. The non-default options are hidden until the user clicks the list. The ListBox control prompts the user to select zero or more of many different options. Options are shown in a scrolling list. The Button control displays a button on the webpage that can be clicked to trigger a postback to the web server. For similar functionality with a different presentation, you can use the LinkButton or ImageButton controls. HTML server controls are useful when you need to migrate a classic ASP webpage to ASP.NET, or when you are working with a server control and you need to write a lot of associated client-side JavaScript.

You can use the following questions to test your knowledge of the information in Lesson 1, Exploring Common Server Controls. The questions are also available on the companion CD in a practice test, if you prefer to review them in electronic form.

To configure the test lab for PPTP access, install the PPTP profile on CLIENT1 from the shared folder on IIS1.

Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.

1. 2.

2. When connected, open the IIS1\ROOT shared folder, double-click PPTPCorp.exe, and click Open. 3. When prompted to install the PPTP To CorpNet profile, click Yes. 4. When prompted for whom to make this connection available, ensure that My Use Only is selected and then click OK. 5. When the profile has finished installing, disconnect the Dial-Up To CorpNet connection and open the PPTP To CorpNet connection.

Although RepeaterTest.aspx provides a more convenient listing of the customers in the Customer table, it does nothing to allow editing of that data. I did, however, make the customer name and the Add New button in RepeaterTest.aspx hyperlinks. Remember the links to EditCustomer.aspx I mentioned in the previous section Clicking on these links will take you to the page shown in Figure 9 9.

To add an HTML server control to a webpage, you must drag an HTML element from the Toolbox to the webpage and then perform which of the following tasks

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