Luke's changes. (It technically runs.)

Refactoring/FileManager.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using System.IO;
+
+namespace Refactoring
+{
+    class FileManager
+    {
+        public static List<T> LoadJsonFile<T>(string fileName)
+        {
+            var fileText = File.ReadAllText(fileName);
+
+            return JsonConvert.DeserializeObject<List<T>>(fileText);
+        }
+
+        public static void SaveJsonFile<T>(string fileName, List<T> list)
+        {
+            string json = JsonConvert.SerializeObject(list, Formatting.Indented);
+            File.WriteAllText(fileName, json);
+        }
+    }
+}

Refactoring/Product.cs

@@ -15,6 +15,16 @@ public class Product
         [JsonProperty("Price")]
         public double Price;
         [JsonProperty("Quantity")]
-        public int Qty;
+        public int Quantity;
+
+        internal double GetPrice(int selectedQuantity)
+        {
+            return (Price * selectedQuantity);
+        }
+
+        internal bool HasEnoughInventory(int selectedQuantity)
+        {
+            return (Quantity >= selectedQuantity);
+        }
     }
 }

Refactoring/Program.cs

@@ -1,9 +1,6 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
 
 namespace Refactoring
 {
@@ -12,12 +9,13 @@ public class Program
         public static void Main(string[] args)
         {
             // Load users from data file
-            List<User> users = JsonConvert.DeserializeObject<List<User>>(File.ReadAllText(@"Data/Users.json"));
+            List<User> users = FileManager.LoadJsonFile<User>(@"Data/Users.json");
 
             // Load products from data file
-            List<Product> products = JsonConvert.DeserializeObject<List<Product>>(File.ReadAllText(@"Data/Products.json"));
+            List<Product> products = FileManager.LoadJsonFile<Product>(@"Data/Products.json");
 
-            Tusc.Start(users, products);
+            var tusc = new Tusc(users, products);
+            tusc.Start();
         }
     }
 }

Refactoring/Refactoring.csproj

@@ -45,11 +45,13 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="FileManager.cs" />
     <Compile Include="Product.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Tusc.cs" />
     <Compile Include="User.cs" />
+    <Compile Include="UserInterface.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />