code:
 HttpWebRequest request = (HttpWebRequest)
            WebRequest.Create("http://ya.ru");  

code:
 <system.serviceModel> (line 136)  
		<extensions>
			<behaviorExtensions>
				<add name="Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior" type="Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior, Microsoft.VisualStudio.Diagnostics.ServiceModelSink, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
				<add name="persistenceProvider" type="System.ServiceModel.Configuration.PersistenceProviderElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="workflowRuntime" type="System.ServiceModel.Configuration.WorkflowRuntimeElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="enableWebScript" type="System.ServiceModel.Configuration.WebScriptEnablingElement, System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="webHttp" type="System.ServiceModel.Configuration.WebHttpElement, System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
			</behaviorExtensions>
			<bindingElementExtensions>
				<add name="webMessageEncoding" type="System.ServiceModel.Configuration.WebMessageEncodingElement, System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="context" type="System.ServiceModel.Configuration.ContextBindingElementExtensionElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
			</bindingElementExtensions>
			<bindingExtensions>
				<add name="wsHttpContextBinding" type="System.ServiceModel.Configuration.WSHttpContextBindingCollectionElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="netTcpContextBinding" type="System.ServiceModel.Configuration.NetTcpContextBindingCollectionElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="webHttpBinding" type="System.ServiceModel.Configuration.WebHttpBindingCollectionElement, System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
				<add name="basicHttpContextBinding" type="System.ServiceModel.Configuration.BasicHttpContextBindingCollectionElement, System.WorkflowServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
			</bindingExtensions>
		</extensions>
		<commonBehaviors><endpointBehaviors><Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior/></endpointBehaviors><serviceBehaviors><Microsoft.VisualStudio.Diagnostics.ServiceModelSink.Behavior/></serviceBehaviors></commonBehaviors>
		<client>
			<metadata>
				<policyImporters>
					<extension type="System.ServiceModel.Channels.ContextBindingElementImporter, system.workflowservices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/>
				</policyImporters>
				<wsdlImporters>
					<extension type="System.ServiceModel.Channels.ContextBindingElementImporter, system.workflowservices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/>
				</wsdlImporters>
			</metadata>
		</client>
	</system.serviceModel>

 

В ответ на:

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xws_reg.exe has been renamed to ServiceModelReg.exe.
Try looking for it in C:\WINDOWS\WinFX\v3.0\Windows Communication Foundation

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