.NET SDK Sample in C# to specify the Item Condition using LookupAttribute

public void AddItemWithLookupAttribute(string uuid)
{
    AddItemCall apicall = new AddItemCall(GetContext());
    ItemType item = new ItemType();
    item.Currency = CurrencyCodeType.USD;
    item.Country = CountryCodeType.US;
    item.PaymentMethods = new BuyerPaymentMethodCodeTypeCollection();
    item.PaymentMethods.Add(BuyerPaymentMethodCodeType.PayPal);
    item.PayPalEmailAddress = 'test@foo.com';
    item.Quantity = 1;
    item.PostalCode = '95125';
    item.ListingDuration = 'Days_7';   
    //Set the ISBN
    item.ExternalProductID = new ExternalProductIDType();
    item.ExternalProductID.Type = ExternalProductCodeType.ISBN;
    item.ExternalProductID.Value = '0439784549';
     //Set the item condition
    item.LookupAttributeArray = new LookupAttributeTypeCollection();
    LookupAttributeType attItemCondition = new LookupAttributeType();
    attItemCondition.Name = 'Condition';
    attItemCondition.Value = 'New';
    item.LookupAttributeArray.Add(attItemCondition);
    item.StartPrice = new AmountType();
    item.StartPrice.currencyID = CurrencyCodeType.USD;
    item.StartPrice.Value = 20;
    item.UUID = uuid;
    item.PictureDetails = new PictureDetailsType();
    //This will automatically use the stock photo and set the gallery image to the stock photo
    item.PictureDetails.GalleryType = GalleryTypeCodeType.Gallery;
    apicall.Execute();
  }

  // Credentials for the call
  context.ApiCredential.ApiAccount.Developer = 'devID';
  context.ApiCredential.ApiAccount.Application = 'appID';
  context.ApiCredential.ApiAccount.Certificate = 'certID';
  context.ApiCredential.eBayToken = 'token';

  // Set the URL
  context.SoapApiServerUrl = 'https://api.sandbox.ebay.com/wsapi'; 

  // Set logging
  context.ApiLogManager = newApiLogManager();
  context.ApiLogManager.ApiLoggerList.Add(new eBay.Service.Util.FileLogger('Messages.log', true, true, true));
  context.ApiLogManager.EnableLogging = true;

  // Set the version
  context.Version = '495';

  return context;