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I'm new to WCF and trying to get my first service running. I'm close but stuck on this problem. In my interface definition file, I have this: [ServiceContract(Namespace="http://mysite.com/wcfservices/2009/02")] public interface IInventoryService { [OperationContract] string GetInventoryName(int InventoryID); } Then I have my class file (for the service) that inherits it: public class InventoryService : IInventoryService { // This method is exposed to the wcf service public string GetInventoryName(int InventoryID) { return "White Paper"; } Finally, in my Host project I have this: ServiceHost host = new ServiceHost(typeof(Inventory.InventoryService)); host.AddServiceEndpoint(typeof(Inventory.InventoryService), new NetTcpBinding(), "net.tcp://localhost:9000/GetInventory"); host.Open(); Everything compiles fine, and when the host goes to add the service endpoint, it bombs with this: "The contract type Inventory.InventoryService is not attributed with ServiceContractAttribute. In order to define a valid contract, the specified type (either contract interface or service class) must be attributed with ServiceContractAttribute." I know I'm missing something simple here. I have the interface clearly marked as a service contract and there's a reference to that project in the Host project.

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