Removing http://tempuri.org Namespace From WSDL

If you need to remove the references to “http://tempuri.org” from the WSDL of your web service, the following are the steps to do so:

• Add [ServiceContract(Namespace = "MyContractNamespace")] to the Interface definition. Example:

[ServiceContract(Namespace = "MyContractNamespace")]
   public interface ITest
   {
       [OperationContract]
       string Echo(string str);
   }

• Add [ServiceBehavior(Namespace = "MyServiceNamespace")] to the service implementation. Example:

[ServiceBehavior(Namespace = "MyServiceNamespace")]
   public class Service : ITest
   {
       public string Echo(string str)
       {
           return str;
       }
   }

• Add bindingNamespace=”MyServiceNamespace” to each endpoint definition in the Web.config file. Example:

<endpoint contract="ITest" binding="wsHttpBinding" address="" bindingNamespace="MyServiceNamespace">

The above three points will make all the references to “tempuri.org” disappear from the WSDL contract of the service (i.e. http://localhost/MyService.svc?wsdl).

References: eliminating http://tempuri.org in wsdl (link), wsdl:import namespace (link)