Hi. I got a wsdl file in email. At first I didn't know how to use it. I've simply saved the file to my disk. Opened visual studio...added a service reference...provided path to file, and service was discovered. I opened the object browser to see the types and methods that got imported. I figure anything that ends with the name 'Client' is a good place to start using the web service. I've tried using a simple method to get data but it has run into and expception. Need help in resolving it.

System.InvalidOperationException was unhandled
  Message="The XML element 'ListsRequest' from namespace 'http://www.asd.org/MGMMIRAGE.MDM.WS/Customer' references a method and a type. Change the method's message name using WebMethodAttribute or change the type's root element using the XmlRootAttribute."
  Source="System.Xml"
  StackTrace:
       at System.Xml.Serialization.XmlReflectionImporter.ReconcileAccessor(Accessor accessor, NameTable accessors)
       at System.Xml.Serialization.XmlReflectionImporter.ImportMembersMapping(String elementName, String ns, XmlReflectionMember[] members, Boolean hasWrapperElement, Boolean rpc, Boolean openModel, XmlMappingAccess access)
       at System.Xml.Serialization.XmlReflectionImporter.ImportMembersMapping(String elementName, String ns, XmlReflectionMember[] members, Boolean hasWrapperElement, Boolean rpc, Boolean openModel)
       at System.Xml.Serialization.XmlReflectionImporter.ImportMembersMapping(String elementName, String ns, XmlReflectionMember[] members, Boolean hasWrapperElement, Boolean rpc)
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.XmlSerializerImporter.ImportMembersMapping(XmlName elementName, String ns, XmlReflectionMember[] members, Boolean hasWrapperElement, Boolean rpc, Boolean isEncoded, String mappingKey)
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.OperationReflector.ImportMembersMapping(String elementName, String ns, XmlReflectionMember[] members, Boolean hasWrapperElement, Boolean rpc, String mappingKey)
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.OperationReflector.LoadBodyMapping(MessageDescription message, String mappingKey, MessagePartDescriptionCollection& rpcEncodedTypedMessageBodyParts)
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.OperationReflector.CreateMessageInfo(MessageDescription message, String key)
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.OperationReflector.EnsureMessageInfos()
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.EnsureMessageInfos()
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.OperationReflector.get_Request()
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.CreateFormatter()
       at System.ServiceModel.Description.XmlSerializerOperationBehavior.System.ServiceModel.Description.IOperationBehavior.ApplyClientBehavior(OperationDescription description, ClientOperation proxy)
       at System.ServiceModel.Description.DispatcherBuilder.BindOperations(ContractDescription contract, ClientRuntime proxy, DispatchRuntime dispatch)
       at System.ServiceModel.Description.DispatcherBuilder.ApplyClientBehavior(ServiceEndpoint serviceEndpoint, ClientRuntime clientRuntime)
       at System.ServiceModel.Description.DispatcherBuilder.BuildProxyBehavior(ServiceEndpoint serviceEndpoint, BindingParameterCollection& parameters)
       at System.ServiceModel.Channels.ServiceChannelFactory.BuildChannelFactory(ServiceEndpoint serviceEndpoint)
       at System.ServiceModel.ChannelFactory.CreateFactory()
       at System.ServiceModel.ChannelFactory.OnOpening()
       at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
       at System.ServiceModel.ChannelFactory.EnsureOpened()
       at System.ServiceModel.ChannelFactory`1.CreateChannel(EndpointAddress address, Uri via)
       at System.ServiceModel.ChannelFactory`1.CreateChannel()
       at System.ServiceModel.ClientBase`1.CreateChannel()
       at System.ServiceModel.ClientBase`1.CreateChannelInternal()
       at System.ServiceModel.ClientBase`1.get_Channel()
       at MDMWSDemo.MDMWebSrvc.MGMCustomerSoapPortTypeClient.MDMWSDemo.MDMWebSrvc.MGMCustomerSoapPortType.CountryCodeGet(CountryCodeGetRequest request) in C:\Documents and Settings\tbhagava01\My Documents\Visual Studio 2008\Projects\MDMWSDemo\MDMWSDemo\Service References\MDMWebSrvc\Reference.cs:line 2983
       at MDMWSDemo.MDMWebSrvc.MGMCustomerSoapPortTypeClient.CountryCodeGet(String countryCode) in C:\Documents and Settings\tbhagava01\My Documents\Visual Studio 2008\Projects\MDMWSDemo\MDMWSDemo\Service References\MDMWebSrvc\Reference.cs:line 2989
       at MDMWSDemo.Program.Main(String[] args) in C:\Documents and Settings\tbhagava01\My Documents\Visual Studio 2008\Projects\MDMWSDemo\MDMWSDemo\Program.cs:line 15
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: