Add reference to System.Runtime.Serialization when generating service references.

src/Main/Base/Project/Src/Gui/Dialogs/ReferenceDialog/ServiceReference/ServiceReferenceGenerator.cs

@@ -137,6 +137,7 @@ namespace ICSharpCode.SharpDevelop.Gui.Dialogs.ReferenceDialog.ServiceReference
 			project.AddServiceReferenceProxyFile(referenceFileName);
 			project.AddServiceReferenceMapFile(mapFileName);
 			
+			project.AddAssemblyReference("System.Runtime.Serialization");
 			project.AddAssemblyReference("System.ServiceModel");
 			
 			if (!project.HasAppConfigFile()) {

src/Main/Base/Test/ServiceReferences/ServiceReferenceGeneratorTests.cs

@@ -314,6 +314,21 @@ namespace ICSharpCode.SharpDevelop.Tests.ServiceReferences
 			fakeProject.AssertWasCalled(p => p.AddAssemblyReference("System.ServiceModel"));
 		}
 		
+		[Test]
+		public void AddServiceReference_ProjectDoesNotHaveSystemRuntimeSerializationReference_SystemRuntimeSerializationReferenceAddedToProject()
+		{
+			CreateGenerator();
+			AddProxyFileNameForServiceName("MyService");
+			AddMapFileNameForServiceName("MyService");
+			generator.Options.ServiceName = "MyService";
+			
+			generator.AddServiceReference();
+			
+			SvcUtilRunCompletedSuccessfully();
+			
+			fakeProject.AssertWasCalled(p => p.AddAssemblyReference("System.Runtime.Serialization"));
+		}
+		
 		[Test]
 		public void AddServiceReference_ProjectDoesNotHaveSystemServiceModelReference_ProjectIsSavedAfterReferenceIsAdded()
 		{