How to return more than one value using WCF

using System.ServiceModel;

namespace Example
{
    public class EmployeeDetailsResponse
    {
        public string Name { get; set; }
        public string Salary { get; set; }
    }

    public class EmployeeSaveDetailsRequest
    {
        public string Name { get; set; }
        public string Salary { get; set; }
    }

    [ServiceContract]
    public interface ISomeoperation
    {
        [OperationContract]
        public EmployeeDetailsResponse GetEmpDetails();
        [OperationContract]
        public void SaveEmployeeDetails(EmployeeSaveDetailsRequest employeeSaveDetailsRequest);
    }

    public class SomeOperation : ISomeoperation
    {
        public EmployeeDetailsResponse GetEmpDetails()
        {
            //Implemet the operation
            return new EmployeeDetailsResponse(); // by filling the EmployeeDetailsResponse
        }

        public void SaveEmployeeDetails(EmployeeSaveDetailsRequest employeeSaveDetailsRequest)
        {
            //Implemet the operation
        }
    }

}