using System.Text; 

namespace DAL.Generators 

{ 

    public class BaseRepository 

    { 

​

        BaseStorage storage = new BaseStorage(); 

        public int IncrementCartIndex() => GetIndex("cart");

        public int IncrementOrderIndex() => GetIndex("order");

        public int IncrementOrderItemIndex() => GetIndex("orderItem");

        private int GetIndex(string nameIndex) 

        { 

            string pathIndex = "full path to index" + nameIndex + "Index.txt";

            var index = storage.GetCurrentIndex(pathIndex); 

            if (index != -1) 

            { 

                storage.UpdateIndex(index + 1, pathIndex); 

            } 

            else 

            { 

                storage.UpdateIndex(1, pathIndex); 

            } 

            return storage.GetCurrentIndex(pathIndex); 

        } 

    } 

    public class BaseStorage 

    {

        .....

    } 

}