print barcode labels vb.net <endpoint address="" binding="wsDualHttpBinding" contract="DemoService.IConcurrency" /> in C#

Draw DataMatrix in C# <endpoint address="" binding="wsDualHttpBinding" contract="DemoService.IConcurrency" />

<endpoint address="" binding="wsDualHttpBinding" contract="DemoService.IConcurrency" />
Encoding Data Matrix 2d Barcode In C#.NET
Using Barcode maker for .NET Control to generate, create Data Matrix ECC200 image in .NET applications.
www.OnBarcode.com
Scan ECC200 In C#
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
The client portion of the application must be modified to support the callback. 12. In Solution Explorer, right-click the Form1 file in the DemoClient project and select View Code. To receive the callback, the Form1 class must implement the IConcurrencyCallback interface. 13. Modify the class declaration for the form to the following, as shown in bold:
Printing Barcode In Visual C#.NET
Using Barcode maker for VS .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Recognize Barcode In Visual C#.NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
' VB Public Class Form1 Implements IConcurrencyCallback // C# public partial class Form1 : Form, IConcurrencyCallback
ECC200 Creator In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
www.OnBarcode.com
Painting DataMatrix In .NET Framework
Using Barcode printer for .NET framework Control to generate, create ECC200 image in .NET framework applications.
www.OnBarcode.com
The ReceiveCallCount method must be implemented in the Form1 class. This method accepts an integer as a parameter. It builds a string, using the incoming value, and displays it on the form. Use the Invoke method to accomplish the display because the ListBox control must be updated on the user interface (UI) thread. 14. Add the following method to the Form1 class:
Print DataMatrix In VB.NET
Using Barcode generation for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in .NET applications.
www.OnBarcode.com
PDF417 Generator In Visual C#
Using Barcode creator for .NET Control to generate, create PDF 417 image in Visual Studio .NET applications.
www.OnBarcode.com
' VB Public Sub ReceiveCallCount(callCount As Integer) _ Implements DemoLibrary.IConcurrencyCallback.ReceiveCallCount Dim updateMethod As New SendMessage(AddressOf addToLabel) Me.Invoke(updateMethod, String.Format("The updated callCount is {0}.", _ callCount)) End Sub // C# public void ReceiveCallCount(int callCount) { SendMessage updateMethod = new SendMessage(addToLabel);
Encode USS Code 39 In Visual C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
www.OnBarcode.com
Matrix Barcode Maker In C#.NET
Using Barcode drawer for .NET Control to generate, create Matrix 2D Barcode image in VS .NET applications.
www.OnBarcode.com
Lesson 1: Concurrency in WCF Applications
Data Matrix 2d Barcode Maker In C#.NET
Using Barcode maker for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
www.OnBarcode.com
Print USPS POSTal Numeric Encoding Technique Barcode In C#
Using Barcode generation for .NET Control to generate, create USPS POSTal Numeric Encoding Technique Barcode image in VS .NET applications.
www.OnBarcode.com
this.Invoke(updateMethod, String.Format("The updated callCount is {0}.", callCount)); }
Drawing Code 128B In None
Using Barcode creator for Software Control to generate, create USS Code 128 image in Software applications.
www.OnBarcode.com
QR Code JIS X 0510 Creation In Java
Using Barcode creation for Android Control to generate, create Quick Response Code image in Android applications.
www.OnBarcode.com
The binding on the service was modified (in step 11) to support a duplex binding. The client application must use the same binding. 15. In Solution Explorer, double-click the app.config file in the DemoClient project. 16. Locate the endpoint element. Set the binding on the endpoint element to use the wsDualHttpBinding binding. When you are finished, the endpoint element should look like the following. (Note that address= and the URL that follows should be typed on a single line; they are formatted here to fit on the printed page.)
UCC.EAN - 128 Maker In Java
Using Barcode generation for Java Control to generate, create UCC.EAN - 128 image in Java applications.
www.OnBarcode.com
Painting Code 128 Code Set C In Objective-C
Using Barcode generator for iPhone Control to generate, create Code 128A image in iPhone applications.
www.OnBarcode.com
<endpoint address= "http://localhost:8731/Design_Time_Addresses/DemoService/ConcurrencyService/" binding="wsDualHttpBinding" contract="DemoService.IConcurrency" name="IConcurrency" />
ECC200 Scanner In .NET Framework
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Make Bar Code In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications.
www.OnBarcode.com
17. Launch the application by pressing F5. 18. In the Windows form that appears, type 1 into the Number Of Concurrent Clients text box and press the Start Demo button. In a few seconds, an InvalidOperationException will appear in the ConcurrencyService class. The problem is that when the concurrency mode is marked as single, making a callback means that a deadlock might occur (if the client were to call back into the service). 19. Stop running the application. 20. In the ConcurrencyService file, locate the ServiceBehavior attribute. To correct this problem, the concurrency mode should be changed to Reentrant. The class declaration should look like the following (with changes shown in bold):
UPC-A Printer In None
Using Barcode printer for Font Control to generate, create GTIN - 12 image in Font applications.
www.OnBarcode.com
Make USS Code 39 In VS .NET
Using Barcode encoder for Reporting Service Control to generate, create Code 39 Extended image in Reporting Service applications.
www.OnBarcode.com
' VB <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Reentrant, _ InstanceContextMode:=InstanceContextMode.Single)> _ Public Class ConcurrencyService Implements IConcurrency // C# [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Reentrant, InstanceContextMode=InstanceContextMode.Single)] public class ConcurrencyService : IConcurrency
21. Launch the application by pressing F5. 22. In the Windows form that appears, type 1 into the Number Of Concurrent Clients text box and press the Start Demo button. Now the messages that appear in the list box are correct, indicating that the callback took place. Press Shift+F5 to terminate the application.
12
Concurrency
Lesson Summary
Using a ConcurrencyMode of Single minimizes the issues associated with concurrency. The relationship between the ConcurrencyMode and the InstanceContextMode must be taken together to determine when concurrency must be addressed. When more than one request is allowed into a service object, care must be taken to avoid deadlocks or inconsistent state. Designing a reentrant system requires the developer not only to be aware of synchronization of state access but also to handle the possibility of state changes during the execution of an external method call.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 1, Concurrency in WCF Applications. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
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.
Copyright © OnBarcode.com . All rights reserved.