asp.net core barcode scanner

asp.net core barcode scanner

asp.net core barcode scanner

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(In client s proxy class...) Dim service As New localhost.SampleService Sub RunTheMethod() Run another thread. Dim tr As New Thread(AddressOf CallWebMethod) tr.Start() Abort the method call when a condition becomes true. For example, a file is updated or a process is terminated. (In this demo we just wait for some seconds.) Thread.Sleep(5000) service.Abort() End Sub Sub CallWebMethod() Try Invoke a method that takes 10 seconds to complete. service.LengthyMethodCall(10) Catch ex As WebException If ex.Status = WebExceptionStatus.RequestCanceled Then The method call has been canceled. End If End Try End Sub

Lessons in this chapter:

The simplest way to restrict the data that a user can see in a report is to use linked reports with parameters. Using this approach, you can easily control which data is displayed in the report, and then use item-level security to control access to each linked report. Alternatively, you can design a report that takes advantage of the User function from the global parameters collection to identify the current user. You can pass the user identification either to a query parameter or to a filter to restrict the data in the report.

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All browsers know how to replace an old page with a new page; until a few years ago, though, not all of them provided an object model to represent the current contents of the page. (Today, I can hardly mention a single modern, commercially available browser that doesn t expose a read/write page DOM.) For browsers that supply an updatable object model for HTML pages, the JavaScript callback function can refresh specific portions of the old page, thus making them look updated, without a full reload. There s a World Wide Web Consortium (W3C) ratified standard for the updatable DOM you can find at http://www.w3.org/TR/DOM-Level-3-Core. A W3C document for the proxy component is currently being developed. It takes the form of the existing XMLHttpRequest object and is devised as an interface exposed by the browser to allow script code to perform HTTP client functionality, such as submitting form data or loading data from a remote Web site. The latest candidate recommendation is at http://www.w3.org/TR/XMLHttpRequest.

With drilldown, the user can click the plus sign to expand the report and click the minus sign to collapse the report at will. By default, the report is completely collapsed when it is opened.

while remote clients are shown a custom error page or a generic page if no custom page is specified. This policy is controlled through the Mode attribute. The Mode attribute can be set to On, Off, or RemoteOnly, which is the default. If it s set to On, custom error pages are displayed both locally and remotely; if it s set to Off, no special error-handling mechanism is active and all users receive the typical ASP.NET (yellow) error page with the original runtime s or compiler s error message and the stack trace. Custom error pages can be specified in two ways. You can provide a generic error page as well as error-specific pages. A custom error page that is not error-specific can be set through the defaultRedirect attribute of the <customErrors> element. This setting is ignored if the mode is Off.

Performance Windows 2000 Advanced Server and Datacenter Server implement Symmetric Multiprocessing (SMP) support that enables servers to use up to 8 processors for Advanced Server and 32 processors for Datacenter Server efficiently. In addition, Advanced Server includes enhanced memory features that allow the server to have up to 8 gigabytes (GB) of memory, Datacenter Server allows up to 64 GB of memory. Manageability Windows 2000 Server provides a diverse set of tools that allow you to manage your Web site and plug into the Microsoft Management Console (MMC), so server functions can be managed in a central location. Some of the administration features of Windows 2000 include event logging, Performance Monitor, Terminal Services, and Windows Management Instrumentation (WMI). Security Windows 2000 provides a secure environment in which access to files or services can be rigorously controlled using Active Directory, security/ authentication protocols, and encrypted communication. Component services The Windows 2000 COM+ services provide application functionality to developers and administrators. This built-in functionality allows distributed transactional applications to be developed without developing the underlying infrastructure to support atomic transactions or asynchronous operations. You can find more information about Windows 2000 Server at http:// www.microsoft.com/windows2000/

The Card Type field is a drop-down list; therefore, a server-side check should occur to confirm that this field is not null.

Create an ArrayList with 100 elements equal to a null string. Dim al As ArrayList = ArrayList.Repeat( ", 100)

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