how would i return a instance of interface Infocard? : i am currently doing an assignment for my computer science course,  however i have ran into a road block preventing me advancing any further.  i am trying to return the InfoCard interface and  i am unsure as to how.   

    public interface IInfoCardFactory
        {
            IInfoCard CreateNewInfoCard(string category);
            IInfoCard CreateInfoCard(string initialDetails);
            string[] CategoriesSupported { get; }
            string GetDescription(string category);
        }
      

    public IInfoCard CreateNewInfoCard(string category)
            {
    
                ......
            }

