DataFactory.cs

namespace Module.Data
{
    public class DataFactory
    {
        private static IData data;

        static IData Create(IData datasubstitute = null)
        {
            if (datasubstitute != null)
            {
                return datasubstitute;
            }
            if (data == null)
            {
                data = new Data();
            }
            return data;
        }
    }
}