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  if (shippingOptions != null)
            {
                var selectedOption = shippingOptions.SelectedShippingOptionDetails;
                result.SelectedShippingOption = selectedOption;
                result.ShowDeliveryMethodInformation = cartResponse.ShippingInfo.RequiresDelivery;
                result.ShowSelectedShippingOption = selectedOption != null && !string.IsNullOrEmpty(selectedOption.Id);
                if (_contactsSettings.Current.EndUserContact.Mode != ContactSettingsMode.Off)
                {
                    result.ShowEndUserContactInformation = true;
                }

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    public class Employee
    {
        public string Fname { get; set; }
        public string Lname { get; set; }
        public string Desig { get; set; }
    }
    
    Now, for doing the same, we will add data annotation as shown below in the sample
    
    [DataContract]

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    public interface IEmployee
    {
        string PrintEmployee(Employee empl);
    }
    
    Now, to make the service contract, we need to annotate the same with 
    different attributes as shown below.
    
    [ServiceContract]
    public interface IEmployee

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 public class WCFDemo : IEmployee
    {
        //Service implementation
        public string PrintEmployee(Employee empl)
        {
            // Business Logic goes here...
            return string.Format("Hello Employee {0} {1}. Your Designation is {2}", empl.Fname, empl.Lname, empl.Desig);
        }
    }

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[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single,
        ConcurrencyMode = ConcurrencyMode.Multiple)]
 public class WCFDemo : IEmployee
    {
        [OperationBehavior(Impersonation = ImpersonationOption.Required)]
        public string PrintEmployee(Employee empl)
        {
            return string.Format("Hello Employee {0} {1}. Your Designation is {2}", empl.Fname, empl.Lname, empl.Desig);
        }

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading.Tasks;

namespace EmployeeService
{