About UnityContainer Register Default or Parameterised Constructor or Rsolve them

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C#

DI

Unity

I have A Interface

<br />
public interface ICountryDataService<br />
   {<br />
   void CountryDataService_Save(ICountry country);<br />
   }<br />

And implement in a Class

<br />
class CountryDataService : DataServiceBase, ICountryDataService<br />
    {<br />
        public CountryDataService()<br />
        {<br />
        }<br />
<br />
<br />
        public CountryDataService(IDbTransaction txn)<br />
            : base(txn)<br />
        {<br />
        }<br />
<br />
public void CountryDataService_Save(ICountry country)<br />
        {<br />
Throw Not Implemented Exception;<br />
        }<br />
<br />
    }<br />

And Just Want to register

<br />
  public static class DataServiceContainer<br />
   {<br />
       public static void InitializeContainer(IUnityContainer container)<br />
       {<br />
           if (container == null)<br />
               throw new ArgumentNullException("container");          <br />
           container.RegisterType<ICountryDataService, CountryDataService>();<br />
       }<br />
   }

And resolve on the basis of parameter or without parameter ,
But this gives Error , Please help... :-(