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In .NET, there is no general-purpose way to trigger code on specific threads. The Control.Invoke() method is a special exception to this rule that makes writing multithreaded Windows applications much easier. When you call Control.Invoke(), the code checks that the control is created and its Windows handle exists. If its handle exists, the rest of the process is straightforward. The Invoke() method uses the GetWindowThreadProcessId() Win32 API function to find the thread ID for the control, and then compares that value against the currently executing one using GetCurrentThreadId(). This stage determines whether or not marshalling is needed. Life becomes much more ugly if the control s handle isn t created yet. In this case, the Invoke() method walks the control hierarchy trying to find out if the control s parent (or its parent s parent, and so on), have been created yet. If they have, the Invoke() method grabs that thread ID. If you re facing erratic behavior or you think your Control.Invoke() method is taking longer than it should because you re using Invoke() on a control that is created dynamically, you have two possible solutions. You can access the Control.Handle property in your code before you call the Invoke() method, which ensures that the control handle is created. (Of course, you'll need to access Control.Handle from the main application thread.) Or, you can skip directly to the parent by calling the Invoke() method of a container control or the hosting form. asp net barcode reader . NET Barcode Reader SDK for .NET, C#, ASP.NET, VB.NET ...
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Then decode the barcode on the server side, and send the result back to the Web client. Here is an HTML5 solution for capturing and ... In the lifetime of an application, especially a web-based one, a large number of database connection instances will be opened and closed. To illustrate a case scenario, a web page may open two database connections on average. Assuming this web page receives 100 hits a minute (a realistic figure in the case of high-volume applications in some large organizations), that comes up to about 200 connections opened on the database every minute, a fairly large number for any database. Connection pooling is Oracle s way of handling large number of connection requests. Opening a new connection to the database is usually a very slow and resource-intensive task. Connection pooling works by not destroying a connection object after it has been closed. It is merely kept in an inactive state until a new connection request arrives, whereby it is then reused. This allows the database to avoid the expensive operation of opening a totally new connection. You can specify whether to enable or disable connection pooling in the connection string itself (although it is enabled by default). In fact, if you recall earlier from 3, there were a few other parameters that you could tweak in the connection string to adjust the performance of the connection pool. In this section, you will directly measure the performance difference between a code sample that uses connection pooling and one that doesn t. You can do this by measuring the time taken to open and close ten connections, in one case with connection pooling enabled and in the other case disabled. Create a new form, place a button on the form, and write the code shown in Listing 12-1. Listing 12-1. Opening and Closing Ten Connections With and Without Connection Pooling scan qr code java app, convert pdf to excel using itextsharp in c#, pdf to word c#, barcode font in vb.net, convert image to pdf c#, rdlc code 128 barcode scanner asp.net c# Barcode in C# , Using C# Barcode Generator & C# Barcode Reader ...
Home >; Barcode Generating & Scanning in C# ; more ... Generate barcodes in any static web pages (.html) and dynamic ones (. aspx , jsp, asp, php, perl). asp net barcode reader How to integrate barcode scanner into an ASP . NET Web application ...
Hi, Is it feasible to integrate barcode scanner into an asp . net web application . What are the challanges. Which is the best third party control to ... Finally, to marshal your call, Control.Invoke() posts a message to the message queue for the user interface thread (using the Win32 API function PostMessage). As with any other event in a Windows application, this message isn t handled until your application has an idle moment. In other words, if your main thread is tied up with some intensive processing and you use Control.Invoke(), the call may be deferred for some time. Similarly, when your call does execute, it will temporarily take control away from your main thread. For the same reason, make sure that you perform any processor-intensive work on the separate thread before you use Control.Invoke(). For a more detailed look at the implementation behind Control.Invoke(), refer to Justin Rogers's post at http://weblogs.asp.net/justin_rogers/articles/126345.aspx. barcode scanner programming asp.net how we add barcode scanner in asp . net - C# Corner
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