I'm getting errors

Question

Following errors, I'm getting

 

 

 

Warehouse.cs(34,36): error CS0246: The type or namespace name 'StockSaleTransaction' could not be found (are you missing a using directive or an assembly reference?) [C:\Users\User\Documents\Codes\Warehouse\Warehouse.csproj]

Warehouse.cs(38,36): error CS0246: The type or namespace name 'StockPurchaseTransaction' could not be found (are you missing a using directive or an assembly reference?) [C:\Users\User\Documents\Codes\Warehouse\Warehouse.csproj]

Warehouse.cs(42,36): error CS0246: The type or namespace name 'StockAdjustmentTransaction' could not be found (are you missing a using directive or an assembly reference?) [C:\Users\User\Documents\Codes\Warehouse\Warehouse.csproj]

 

Can please help me to find errors

 

 

This is my code

 

using System;

using SplashKitSDK;

using System.Collections.Generic;

public class Warehouse

{

private List<Stock> _stockItems = new List<Stock>();

public void AddNewStockItem(Stock stock)

{

_stockItems.Add(stock);

}

public Stock GetStock(string name)

{

foreach (Stock stock in _stockItems)

{

if (stock.Name.ToLower() == name.ToLower())

{

Console.WriteLine(stock);

return stock;

}

}

return null;

}

public void ExecuteTransaction(StockSaleTransaction transaction)

{

transaction.Execute();

}

public void ExecuteTransaction(StockPurchaseTransaction transaction)

{

transaction.Execute();

}

public void ExecuteTransaction(StockAdjustmentTransaction transaction)

{

transaction.Execute();

}

}