using System;

using System.Collections.Generic;

using System.Linq;

​

public class Stock

{

    public int ItemId;

    public int StoreId;

    public int UnitTypeId;

    public int Quantity;

}

​

public class StoreInventoryDetails : Stock

{

}

​

public class EmployeeDetails

{

    public int EmployeeId;

    public int StoreId;

}

public class Program

{

    static readonly List<EmployeeDetails> EmployeeList = new List<EmployeeDetails> { new EmployeeDetails { EmployeeId = 1, StoreId = 1 } };

    static readonly List<Stock> StockList = new List<Stock> { new Stock { ItemId = 1, Quantity = 50, StoreId = 1, UnitTypeId = 1 } };

    static readonly List<StoreInventoryDetails> InventoryList = new List<StoreInventoryDetails>

        {

            new StoreInventoryDetails { ItemId = 1, StoreId = 1, Quantity = 60},

            new StoreInventoryDetails { ItemId = 2, StoreId = 1, Quantity = 40}

        };

    public static void Main(string[] args)

    {

        const int employeeId = 1;

        var storeId = EmployeeList.Single(t => t.EmployeeId == employeeId).StoreId;

        CanAddProduct(1, storeId); // false

        CanAddProduct(2, storeId); // true

    }

​

    static bool CanAddProduct(int itemId, int storeId)

    {

        var inventory = InventoryList.FirstOrDefault(t => t.ItemId == itemId && t.StoreId == storeId);

        if (inventory == null)

        {

            throw new ApplicationException("No such product in inventory");

        }

        var stock = StockList.Where(st => st.ItemId == itemId && st.Quantity < inventory.Quantity && st.StoreId == storeId);

​

        if (stock.Any())

        {

            Console.WriteLine("You can't add ItemId={0}. You have The minimum stock", itemId);

            return false;

        }

        Console.WriteLine("You can add ItemId={0}", itemId);

        return true;

    }

}