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(Each correct answer presents part of the solution. Choose two.)<br />A. Add the following XML segment between lines 10 and 11.<br /><endpoint?address=""<br />binding="mexHttpBinding"<br />contract="IMetadataExchange"<br />/><br />B. Add the following XML segment between lines 10 and 11.<br /><endpoint?address=""<br />binding="basicHttpBinding"<br />contract="IMetadataExchange"<br />/><br />C. Add the following XML segment between lines15 and 16.<br /><serviceDiscovery><br /><announcementEndpoints><br /><endpoint address=""/><br /></announcementEndpoints><br /></serviceDiscovery><br />D. Add the following XML segment between lines 15 and 16<br /><serviceMetadata httpGetEnabled="true"/><br />Answer: AD<br /><br /><strong>Microsoft</strong>   <a href="http://www.itcertmaster.com/070-521-Csharp.html">070-521-Csharp</a>   <strong>070-521-Csharp exam</strong>   <strong>070-521-Csharp</strong><br />17. Four Windows Communication Foundation (WCF) services are hosted in Microsoft Internet<br />Information Services (IIS). No behavior configuration exists in the web.config file.<br />You need to configure the application so that every service and endpoint limits the number of concurrent<br />calls to 50 and the number of concurrent sessions to 25.<br />Which XML segment should you add to the system.serviceModel configuration section of the web.config<br />file?<br />A. <behaviors><br /><serviceBehaviors><br /><behavior name="*"><br /><serviceThrottling maxConcurrentCalls="50" maxConcurrentSessions="25"/><br /></behavior><br /></serviceBehaviors><br /></behaviors><br />B. <behaviors><br /><serviceBehaviors><br /><behavior name="default"><br /><serviceThrottling maxConcurrentCalls="50" maxConcurrentSessions="25"/><br /></behavior><br /></serviceBehaviors><br /></behaviors><br />C. <behaviors><br /><serviceBehaviors><br /><behavior name=""><br /><serviceThrottling maxConcurrentCalls="50" maxConcurrentSessions="25"/><br /></behavior><br /></serviceBehaviors><br /></behaviors><br />D. <behaviors><br /><serviceBehaviors><br /><behavior name="ALL"><br /><serviceThrottling maxConcurrentCalls="50" maxConcurrentSessions="25"/><br /></behavior><br /></serviceBehaviors><br /></behaviors><br />Answer: C<br /><br /><strong>Microsoft certification</strong>   <strong>070-521-Csharp practice test</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp practice test</strong><br />18. The endpoint of a Windows Communication Foundation (WCF) service uses basicHttpBinding for its<br />binding. Your company's policies have changed to require that messages not be sent in clear text.<br />You must ensure that all messages are encrypted when traveling across the network.<br />What should you do?<br />A. Set the ProtectionLevel property on the service contract and update the binding attribute in the<br />endpoint element of the configuration file to wsHttpBinding.<br />B. Set the ProtectionLevel property on the service contract and update the bindingConfiguration attribute<br />in the endpoint element of the configuration file to webHttpBinding.<br />C. Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the<br />endpoint element of the configuration file to wsHttpBinding.<br />D. Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration<br />attribute in the endpoint element of the configuration file to wsHttpBinding.<br />Answer: A<br /><br /><strong>Microsoft original questions</strong>   <strong>070-521-Csharp original questions</strong>   <strong>070-521-Csharp</strong><br /><br />NO.2 Your Windows Communication Foundation (WCF) client application uses HTTP to communicate with<br />the service.<br />You need to enable message logging and include all security information such as tokens and nonces in<br />logged messages.<br />What should you do?<br />A. In the application configuration file, add the logKnownPii attribute to the message logging diagnostics<br />source and set the value of the attribute to true.<br />Generate the ContosoService class using the Add Service Reference wizard.<br />Add a reference to System.ServiceModel.Routing.dll.<br />Add the following code segment.<br />ContosoService client = new ContosoService();<br />SoapProcessingBehavior behavior = new SoapProcessingBehavior();<br />behavior.ProcessMessages = true;<br />client.Endpoint.Behaviors.Add(behavior);<br />B. In the application configuration file, add the following XML segment to the system.serviceModel<br />configuration section group.<br /><diagnostics><br /><messageLogging logMessagesAtTransportLevel="true"<br />logEntireMessage="true" /><br /></diagnostics><br />C. In the machine configuration file, add the following XML segment to the system.serviceModel<br />configuration section.<br /><machineSettings enableLoggingKnownPii="true" /><br />Generate the ContosoService class using the Add Service Reference wizard.<br />Add the following code segment.<br />ContosoService client = new ContosoService();<br />client.Endpoint.Behaviors.Add(new CallbackDebugBehavior(true));<br />D. In the machine configuration file, add the following XML segment to the system.serviceModel<br />configuration section.<br /><machineSettings enableLoggingKnownPii="true" /><br />In the application configuration file, add the logKnownPii attribute to the message logging diagnostics<br />source and set the value of the attribute to true.<br />In the application configuration file, add the following XML segment to the system.serviceModel<br />configuration section group.<br /><diagnostics><br /><messageLogging logMessagesAtTransportLevel="true"/><br /></diagnostics><br />Answer: D<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp questions</strong>   <strong>070-521-Csharp questions</strong>   <a href="http://www.itcertmaster.com/070-521-Csharp.html">070-521-Csharp</a><br /><br />NO.3 A Windows Communication Foundation (WCF) application uses a data contract that has several data<br />members.<br />You need the application to throw a SerializationException if any of the data members are not present<br />when a serialized instance of the data contract is deserialized.<br />What should you do?<br />A. Add the KnownType attribute to the data contract. Set a default value in each of the data member<br />declarations.<br />B. Add the KnownType attribute to the data contract. Set the Order property of each data member to<br />unique integer value.<br />C. Set the EmitDefaultValue property of each data member to false.<br />D. Set the IsRequired property of each data member to true.<br />Answer: D<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp answers real questions</strong>   <strong>070-521-Csharp</strong><br /><br />NO.4 You are building a client for a Windows Communication Foundation (WCF) service.<br />You need to create a proxy to consume this service.<br />Which class should you use?<br />A. ChannelFactory<TChannel><br />B. ServiceHost<br />C. ClientRuntime<br />D. CommunicationObject<br />Answer: A<br /><br /><strong>Microsoft test answers</strong>   <strong>070-521-Csharp exam prep</strong>   <strong>070-521-Csharp</strong><br /><br />NO.5 A Windows Communication Foundation (WCF) service is responsible for transmitting XML documents<br />between systems. The service has the following requirements:<br />It must minimize the transmission size by attaching the XML document as is without using escape<br />characters or base64 encoding.<br />It must interoperate with systems that use SOAP but are not built on the .NET platform.<br />You need to configure the service to support these requirements.<br />Which message encoding should you use?<br />A. Binary message encoding<br />B. MTOM (Message Transmission Optimization Mechanism) message encoding<br />C. Text message encoding with message version set to none<br />D. Text message encoding with message version set to SOAP 1.2<br />Answer: B<br /><br /><strong>Microsoft test questions</strong>   <strong>070-521-Csharp test answers</strong>   <strong>070-521-Csharp</strong><br /><br />NO.6 You are creating a Windows Communication Foundation (WCF) service that is implemented as follows.<br />(Line numbers are included for reference only.)<br />01 [ServiceContract]<br />02 [ServiceBehavior(IncludeExceptionDetailsInFaults = true)]<br />03 public class OrderService<br />04 {<br />05 [OperationContract]<br />06 public void SubmitOrder(Order anOrder)<br />07 {<br />08 try<br />09 {<br />10<br />11 }<br />12 catch(DivideByZeroException ex)<br />13 {<br />14<br />15 }<br />16 }<br />17 }<br />You need to ensure that the stack trace details of the exception are not included in the error information<br />sent to the client.<br />What should you do?<br />A. Replace line 14 with the following line.<br />throw;<br />B. Replace line 14 with the following line.<br />throw new FaultException<Order>(anOrder, ex.ToString());<br />C. After line 05, add the following line.<br />[FaultContract(typeof(FaultException<Order>))]<br />Replace line 14 with the following line.<br />throw ex;<br />D. After line 05, add the following line.<br />[FaultContract(typeof(FaultException<Order>))]<br />Replace line 14 with the following line.<br />throw new FaultException<Order>(anOrder, "Divide by zero exception");<br />Answer: D<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp questions</strong>   <strong>070-521-Csharp</strong><br /><br />NO.7 You are moving a Windows Communication Foundation (WCF) service into production.<br />You need to be able to monitor the health of the service. You only want to enable all performance counter<br />instances exposed by the ServiceModelService 4.0.0.0 counter group.<br />Which element should you add to the system.serviceModel section in the application configuration file?<br />A. <diagnostics performanceCounters="ServiceOnly" /><br />B. <diagnostics wmiProviderEnabled="true" performanceCounters="Off" /><br />C. <diagnostics performanceCounters="All" /><br />D. <diagnostics wmiProviderEnabled="true" /><br />Answer: A<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp demo</strong>   <strong>070-521-Csharp exam dumps</strong><br /><br />NO.8 A WCF service code is implemented as follows. (Line numbers are included for reference only.)<br />01 [ServiceContract]<br />02 [ServiceBehavior(InstanceContextMode =<br />03 InstanceContextMode.Single)]<br />04 public class CalculatorService<br />05 {<br />06 [OperationContract]<br />07 public double Calculate(double op1, string op, double op2)<br />08 {<br />24 }<br />25 }<br />You need to decrease the response time of the service.<br />What are two possible ways to achieve this goal? (Each correct answer presents a complete solution.<br />Choose two.)<br />A. Change the service behavior to the following.<br />[ServiceBehavior(<br />InstanceContextMode = InstanceContextMode.Single,<br />ConcurrencyMode = ConcurrencyMode.Multiple)]<br />B. Change the service behavior to the following.<br />[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]<br />C. Require the clients use threads, the Parallel Task Library, or other mechanism to issue service calls in<br />parallel.<br />D. Require the clients to use async operations when calling the service.<br />Answer: AB<br /><br /><strong>Microsoft pdf</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong><br /><br />NO.9 </serviceBehaviors><br /><br />NO.10 You are developing an application to update a user ¯ s soc i a l s t a t us . You need t o consu m e t he se r v i ce<br />using Windows Communication Foundation (WCF).<br />The client configuration is as follows.<br /><system.serviceModel><br /><bindings><br /><webHttpBinding><br /><binding name="SocialConfig"><br /><security mode="TransportCredentialOnly"><br /><transport clientCredentialType="Basic"<br />?realm="Social API" /><br /></security><br /></binding><br /></webHttpBinding><br /></bindings><br /><client><br /><endpoint address="http://contoso.com"<br />binding="webHttpBinding"<br />bindingConfiguration="SocialConfig"<br />contract="ISocialStatus"<br />name="SocialClient" /><br /></client><br /></system.serviceModel><br />The service contract is defined as follows.<br />[ServiceContract]<br />public interface ISocialStatus<br />{<br />[OperationContract]<br />[WebInvoke(UriTemplate =<br />"/statuses/update.xml?status={text}")]<br />void UpdateStatus(string text);<br />}<br />Which code segment should you use to update the social status?<br />A. using (WebChannelFactory<ISocialStatus> factory =<br />new WebChannelFactory<ISocialStatus>("SocialClient"))<br />{<br />factory.Credentials.UserName.UserName = user.Name;<br />factory.Credentials.UserName.Password = user.Password;<br />ISocialStatus socialChannel = factory.CreateChannel();<br />socialChannel.UpdateStatus(newStatus);<br />}<br />B. using (ChannelFactory<ISocialStatus> factory =<br />new WebChannelFactory<ISocialStatus>(typeof(ISocialStatus)))<br />{<br />factory.Credentials.UserName.UserName = user.Name;<br />factory.Credentials.UserName.Password = user.Password;<br />ISocialStatus socialChannel = factory.CreateChannel();<br />socialChannel.UpdateStatus(newStatus);<br />}<br />C. using (ChannelFactory<ISocialStatus> factory =<br />new ChannelFactory<ISocialStatus>("POST"))<br />{<br />factory.Credentials.Windows.ClientCredential.UserName =<br />user.Name;<br />factory.Credentials.Windows.ClientCredential.SecurePassword.<br />SetAt(0, Convert.ToChar(user.Password));<br />ISocialStatus socialChannel = factory.CreateChannel();<br />socialChannel.UpdateStatus(newStatus);<br />}<br />D. using (WebChannelFactory<ISocialStatus> factory =<br />new WebChannelFactory<ISocialStatus>(typeof(ISocialClient)))<br />{<br />factory.Credentials.Windows.ClientCredential.UserName =<br />user.Name;<br />factory.Credentials.Windows.ClientCredential.SecurePassword.<br />SetAt(0, Convert.ToChar(user.Password));<br />ISocialStatus socialChannel = factory.CreateChannel();<br />socialChannel.UpdateStatus(newStatus);<br />}<br />Answer: A<br /><br /><strong>Microsoft original questions</strong>   <strong>070-521-Csharp exam</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp dumps</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp test answers</strong><br /><br />NO.11 You are consuming a Windows Communication Foundation (WCF) service in an ASP.NET Web<br />application. The service interface is defined as follows.<br />[ServiceContract]<br />public interface ICatalog<br />{<br />[OperationContract]<br />[WebGet(UriTemplate = "/Catalog/Items/{id}",<br />ResponseFormat = WebMessageFormat.Json)]<br />string RetrieveItemDescription(int id);<br />}<br />The service is hosted at /Catalog.svc.<br />You need to call the service using jQuery to retrieve the description of an item as indicated by a variable<br />named itemId.<br />Which code segment should you use?<br />A. $.get(String.format("/Catalog.svc/Catalog/Items/?id={0}", itemId)<br />null,<br />function (data) {<br />},<br />"javascript");<br />B. $.get(String.format("/Catalog.svc/Catalog/Items/{0}", itemId),<br />null,<br />function (data) {<br />},<br />"json");<br />C. $.get(String.format("/Catalog.svc/Catalog/Items/{0}", itemId),<br />null,<br />function (data) {<br />},<br />"xml");<br />D. $.get(String.format("/Catalog.svc/Catalog/Items/id={0}", itemId),<br />null,<br />function (data) {<br />},<br />"json");<br />Answer: B<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp questions</strong>   <strong>070-521-Csharp</strong><br /><br />NO.12 You are developing a Windows Communication Foundation (WCF) service that reads messages from<br />a public non-transactional MSMQ queue.<br />You need to configure the service to read messages from the failed-delivery queue.<br />Which URI should you specify in the endpoint configuration settings of the service?<br />A. net.msmq://localhost/msmq$;FailedMessages<br />B. net.msmq://localhost/msmq$;DeadLetter<br />C. net.msmq://localhost/system$;DeadXact<br />D. net.msmq://localhost/system$;DeadLetter<br />Answer: D<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp exam dumps</strong>   <strong>070-521-Csharp dumps</strong><br /><br />NO.13 You are adding a Windows Communication Foundation (WCF) service to an existing application. The<br />application is configured as follows. (Line numbers are included for reference only.)<br />01?<configuration><br />02 <system.serviceModel><br />03 <services><br />04 <service name="Contoso.Sales.StockService"<br />05 behaviorConfiguration="MetadataBehavior"><br />06 <host><br />07 <baseAddresses><br />08 <add<br />baseAddress="http://contoso.com:8080/StockService" /><br />09 </baseAddresses><br />10 </host><br />11 </service><br />12 </services><br />13 <behaviors><br />14 <serviceBehaviors><br />15 <behavior name="MetadataBehavior"><br />16 </behavior><br /><br />NO.14 You are creating a Windows Communication Foundation (WCF) service to process orders. The data<br />contract for the order is defined as follows.<br />[DataContract]<br />public class Order<br />{<br />[DataMember]<br />public string CardHolderName { get; set; }<br />[DataMember]<br />public string CreditCardNumber { get; set; }<br />}<br />You have the following requirements:<br />Enable the transmission of the contents of Order from the clients to the service.<br />Ensure that the contents of CreditCardNumber are not sent across the network in clear text.<br />Ensure that the contents of CreditCardNumber are accessible by the service to process the order.<br />You need to implement the service to meet these requirements.<br />What should you do?<br />A. Add a DataProtectionPermission attribute to the CreditCardNumber property and set the ProtectData<br />property to true.<br />B. Convert the DataContract to a MessageContract and set the ProtectionLevel property to<br />EncryptAndSign.<br />C. Change the data type of CreditCardNumber from string to SecureString.<br />D. Implement the CreditCardNumber property getter and setter. In the setter, run the value of the<br />CreditCardNumber through the MD5CryptoServiceProvider class TransformBlock method.<br />Answer: B<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp dumps</strong>   <strong>070-521-Csharp practice test</strong>   <strong>070-521-Csharp exam prep</strong>   <strong>070-521-Csharp certification</strong><br /><br />NO.15 You are creating a Windows Communication Foundation (WCF) service that implements operations in<br />a RESTful manner. You need to add a delete operation.<br />You implement the delete method as follows.<br />void DeleteItems(string id);<br />You need to configure WCF to call this method when the client calls the service with the HTTP DELETE<br />operation.<br />What should you do?<br />A. Add the WebInvoke(UriTemplate = "/Items/{id}", Method="DELETE") attribute to the operation.<br />B. Add the HttpDelete attribute to the operation.<br />C. Replace the string parameter with a RemovedActivityAction parameter.<br />D. Replace the return type with RemovedActivityAction.<br />Answer: A<br /><br /><strong>Microsoft test questions</strong>   <a href="http://www.itcertmaster.com/070-521-Csharp.html">070-521-Csharp practice test</a>   <strong>070-521-Csharp exam simulations</strong>   <strong>070-521-Csharp study guide</strong>   <strong>070-521-Csharp test questions</strong><br /><br />NO.16 A Windows Communication Foundation (WCF) service has a callback contract. You are developing a<br />client application that will call this service.<br />You must ensure that the client application can interact with the WCF service.<br />What should you do?<br />A. On the OperationContractAttribute, set the AsyncPattern property value to true.<br />B. On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the<br />client.<br />C. On the client, create a proxy derived from DuplexClientBase<TChannel>.<br />D. On the client, use GetCallbackChannel<T>.<br />Answer: C<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp dumps</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong><br /><br />NO.17 You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the<br />internal implementation at the service layer.<br />You need to expose the following class as a service named Arithmetic with an operation named Sum.<br />public class Calculator<br />{<br />public int Add(int x, int y)<br />{<br />}<br />}<br />Which code segment should you use?<br />A. [ServiceContract(Namespace="Arithmetic")]<br />public class Calculator<br />{<br />[OperationContract(Action="Sum")]<br />public int Add(int x, int y)<br />{<br />}<br />}<br />B. [ServiceContract(ConfigurationName="Arithmetic")]<br />public class Calculator<br />{<br />[OperationContract(Action="Sum")]<br />public int Add(int x, int y)<br />{<br />}<br />}<br />C. [ServiceContract(Name="Arithmetic")]<br />public class Calculator<br />{<br />[OperationContract(Name="Sum")]<br />public int Add(int x, int y)<br />{<br />}<br />}<br />D. [ServiceContract(Name="Arithmetic")]<br />public class Calculator<br />{<br />[OperationContract(ReplyAction="Sum")]<br />public int Add(int x, int y)<br />{<br />}<br />}<br />Answer: C<br /><br /><strong>Microsoft test answers</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp original questions</strong>   <strong>070-521-Csharp certification</strong>   <strong>070-521-Csharp</strong><br /><br />NO.18 A Windows Communication Foundation (WCF) client uses the following service contract. (Line<br />numbers are included for reference only.)<br />01 [ServiceContract]<br />02 public interface IService<br />03 {<br />04 [OperationContract]<br />05 string Operation1();<br />06 [OperationContract]<br />07 string Operation2();<br />08 }<br />You need to ensure that all calls to Operation1 and Operation2 from the client are encrypted and signed.<br />What should you do?<br />A. Set the ProtectionLevel property in line 01 to EncryptAndSign.<br />B. Set the ProtectionLevel property in line 04 and line 06 to Sign.<br />C. Add a SecurityCriticalAttribute for each operation.<br />D. Add a SecuritySafeCriticalAttribute for each operation.<br />Answer: A<br /><br /><strong>Microsoft</strong>   <strong>070-521-Csharp certification training</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp exam simulations</strong><br /><br />NO.19 You are creating a Windows Communication Foundation (WCF) service based on WSHttpBinding.<br />New audit requirements dictate that callers must be authenticated on every call to ensure that their<br />credentials have not been revoked.<br />You need to ensure that the service will not cache the security request token.<br />What should you do?<br />A. Apply a ServiceBehavior attribute to the service implementation class with the InstanceContextMode<br />property set to Single.<br />B. In the message security configuration, change clientCredentialType from IssuedToken to UserName.<br />C. In the message security configuration, set establishSecurityContext to false.<br />D. At the end of every operation, call the SessionStateUtility.RaiseSessionEnd method.<br />Answer: C<br /><br /><strong>Microsoft answers real questions</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong><br /><br />NO.20 A Windows Communication Foundation (WCF) service has the following contract.<br />[ServiceContract(Namespace="http://contoso.com")]<br />public interface IShipping<br />{<br />[OperationContract]<br />string DoWork(int id);<br />}<br />This is one of several service contracts hosted by your application. All endpoints use SOAP 1.2 bindings<br />with WS-Addressing 1.0. The System.ServiceModel.MessageLogging trace source in the<br />system.diagnostics configuration section is configured with one listener.<br />You need to make sure that only the messages that are returned from the DoWork operation are logged.<br />Which XML segment should you add to the system.serviceModel/diagnostics/messageLogging/filters<br />configuration element?<br />A. <add xmlns:addr="http://www.w3.org/2005/08/addressing"><br />//addr:Action[text() =<br />'http://contoso.com/IShipping/DoWorkResponse']<br /></add><br />B. <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><br />//soap:Action[text() =<br />'http://contoso.com/IShipping/DoWorkResponse']<br /></add><br />C. <add xmlns:addr="http://www.w3.org/2005/08/addressing"><br />//addr:Action[text() =<br />'http://contoso.com/IShipping/DoWork']<br /></add><br />D. <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><br />//soap:Action[text() =<br />'http://contoso.com/IShipping/DoWork']<br /></add><br />Answer: A<br /><br /><strong>Microsoft certification</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp</strong>   <strong>070-521-Csharp exam simulations</strong><br /><br /></p><p>ITCertMaster offer the latest <A href="http://www.itcertmaster.com/HP5-T01D.html" target="_blank">HP5-T01D Practice Test</A> and high-quality <A href="http://www.itcertmaster.com/70-332.html" target="_blank">70-332 PDF</A> Exam Questions training material. 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Latest Microsoft 070-521-Csharp of exam practice questions and answers

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