ASP.NET Web PDF Document Viewer/Editor Control Library

Notice the using statement it s important to ensure that you dispose of WCF proxies when you have finished using them. When the client calls this method on the proxy, WCF builds a message containing the inputs, and it sends that to the service. Over in the service (which is running in a separate process, perhaps on a different machine) WCF will receive that message, unpack the inputs, and pass them to the PostNote method in the ChatService class. To try this out, we re going to need to run both the client and the server simultaneously. This means configuring the solution in Visual Studio a little differently. If you rightclick on the WcfChat solution in the Solution Explorer and select Set Startup Projects, the dialog that opens offers three radio buttons. If you select the Multiple Startup Projects radio button, you can choose which of your projects you d like to run when debugging. In this case, we want to change the Action for both the ChatClient and ChatHost projects from None to Start. (We leave the ChatServerLibrary Action as None we don t need to run that project, because our ChatHost project hosts the server library.) Also, we want to give the service a head start so that it s running before the

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client tries to use it, so select ChatHost and click the up arrow next to the list, to tell Visual Studio to run it first. (In theory, this is not a reliable technique, because there s no guarantee that the server will get enough of a head start. In practice, it appears to work well enough for this sort of debugging exercise.) Figure 13-8 shows how these settings should look.

If we run the program by pressing F5, two console windows will open, one for the client and one for the service.

hen you deploy your application for the international market you have to provide localized versions. The reasons for doing so go far beyond the disparate languages spoken by the world s population; in fact, there are disparities regarding how time, dates, and monetary values are represented; and even more complex written language issues such as whether text should be read from the right or the left.

If you re following along, it s possible that you ll see an AddressAlrea dyInUseException with an error message complaining that Another application has already registered this URL with HTTP.SYS. This usually means you have a copy of ChatHost still running somewhere on your desktop you ll find a console window running the service host. Or possibly, the WCF Service Host is still running. This error occurs when you launch a second copy of the service because it tries to listen on the same address as the first, and only one program can receive requests on a particular URL at any one time.

Visual Studio displays the message in its Output window because of the call to Debug.WriteLine in PostNote, just like it did when using the WCF Test Client earlier, verifying that the proxy was able to invoke an operation on the service. (You might

need to look carefully to see this the message can get buried among the various other notifications that appear in the Output window.) Notice that in Example 13-5 we didn t need to tell the proxy what address to use. That s because the Add Service Reference dialog imported more than just the contract definition. It adds information to the ChatClient project s App.config file, shown in all its gory detail in Example 13-6.

Internationalization and localization are actually two parts of the same process. Internationalization is Tip about freeing your application from any ties to a specific location to make it independent of any specific language or culture. Localization is the next step to take an internationalized application and adapt it to a specific location with a specific language and culture.

You then iterate through the DataTable and pull this information out like this: for (int i = 1; i < nRows; i++) { ny = ConvertToDouble(dtTableRows[i]ItemArray[1]); XDate tmpDate = new XDate( ConvertToDateTime(dtTableRows[i]ItemArray[0])); nx = (double)tmpDate; ptAdd(nx, ny); } The closing price for the stock should go on the Y axis, so it comes from ItemArray[1] and is converted to a Double value The original source from Yahoo, and the column on the DataTable, encodes the value as a string This is retrieved and loaded into the ny variable..

< xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IChatService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:8732/Design_Time_Addresses/ ChatServerLibrary/ChatService/" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IChatService" contract="ChatService.IChatService" name="WSHttpBinding_IChatService"> <identity> <userPrincipalName value="ian@idg.interact" /> </identity> </endpoint> </client> </system.serviceModel> </configuration>