diff --git a/SecuritySystem/SecuritySystemFileImplement/DataFileSingleton.cs b/SecuritySystem/SecuritySystemFileImplement/DataFileSingleton.cs
new file mode 100644
index 0000000..975a76f
--- /dev/null
+++ b/SecuritySystem/SecuritySystemFileImplement/DataFileSingleton.cs
@@ -0,0 +1,50 @@
+using SecuritySystemFileImplement.Models;
+using System.Xml.Linq;
+
+namespace SecuritySystemFileImplement
+{
+    internal class DataFileSingleton
+    {
+        private static DataFileSingleton? instance;
+        private readonly string ComponentFileName = "Component.xml";
+        private readonly string OrderFileName = "Order.xml";
+        private readonly string SecureFileName = "Secure.xml";
+        public List<Component> Components { get; private set; }
+        public List<Order> Orders { get; private set; }
+        public List<Secure> Secures { get; private set; }
+        public static DataFileSingleton GetInstance()
+        {
+            if (instance == null)
+            {
+                instance = new DataFileSingleton();
+            }
+            return instance;
+        }
+        public void SaveComponents() => SaveData(Components, ComponentFileName, "Components", x => x.GetXElement);
+        public void SaveSecures() => SaveData(Secures, SecureFileName, "Secures", x => x.GetXElement);
+        public void SaveOrders() { }
+        private DataFileSingleton()
+        {
+            Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!;
+            Secures = LoadData(SecureFileName, "Secure", x => Secure.Create(x)!)!;
+            Orders = new List<Order>();
+        }
+        private static List<T>? LoadData<T>(string filename, string xmlNodeName,
+       Func<XElement, T> selectFunction)
+        {
+            if (File.Exists(filename))
+            {
+                return XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList();
+            }
+            return new List<T>();
+        }
+        private static void SaveData<T>(List<T> data, string filename, string xmlNodeName, Func<T, XElement> selectFunction)
+        {
+            if (data != null)
+            {
+                new XDocument(new XElement(xmlNodeName, data.Select(selectFunction).ToArray())).Save(filename);
+            }
+        }
+    }
+
+}
diff --git a/SecuritySystem/SecuritySystemFileImplement/Models/Secure.cs b/SecuritySystem/SecuritySystemFileImplement/Models/Secure.cs
index f939568..1b281c5 100644
--- a/SecuritySystem/SecuritySystemFileImplement/Models/Secure.cs
+++ b/SecuritySystem/SecuritySystemFileImplement/Models/Secure.cs
@@ -1,4 +1,5 @@
 using SecuritySystemContracts.BindingModels;
+using SecuritySystemContracts.ViewModels;
 using SecuritySystemDataModels.Models;
 using System.Xml.Linq;
 
@@ -10,8 +11,7 @@ namespace SecuritySystemFileImplement.Models
         public string SecureName { get; private set; } = string.Empty;
         public double Price { get; private set; }
         public Dictionary<int, int> Components { get; private set; } = new();
-        private Dictionary<int, (IComponentModel, int)>? _secureComponents =
-       null;
+        private Dictionary<int, (IComponentModel, int)>? _secureComponents = null;
         public Dictionary<int, (IComponentModel, int)> SecureComponents
         {
             get
@@ -19,9 +19,8 @@ namespace SecuritySystemFileImplement.Models
                 if (_secureComponents == null)
                 {
                     var source = DataFileSingleton.GetInstance();
-                    _secureComponents = Components.ToDictionary(x => x.Key, y =>
-                    ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!,
-                    y.Value));
+                    _secureComponents = Components.ToDictionary(x => x.Key,
+                        y => ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!, y.Value));
                 }
                 return _secureComponents;
             }
@@ -37,8 +36,7 @@ namespace SecuritySystemFileImplement.Models
                 Id = model.Id,
                 SecureName = model.SecureName,
                 Price = model.Price,
-                Components = model.SecureComponents.ToDictionary(x => x.Key, x
-               => x.Value.Item2)
+                Components = model.SecureComponents.ToDictionary(x => x.Key, x => x.Value.Item2)
             };
         }
         public static Secure? Create(XElement element)
@@ -52,11 +50,7 @@ namespace SecuritySystemFileImplement.Models
                 Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                 SecureName = element.Element("SecureName")!.Value,
                 Price = Convert.ToDouble(element.Element("Price")!.Value),
-                Components =
-           element.Element("SecureComponents")!.Elements("SecureComponent")
-            .ToDictionary(x =>
-           Convert.ToInt32(x.Element("Key")?.Value), x =>
-           Convert.ToInt32(x.Element("Value")?.Value))
+                Components = element.Element("SecureComponents")!.Elements("SecureComponent").ToDictionary(x => Convert.ToInt32(x.Element("Key")?.Value), x => Convert.ToInt32(x.Element("Value")?.Value))
             };
         }
         public void Update(SecureBindingModel model)
@@ -67,8 +61,7 @@ namespace SecuritySystemFileImplement.Models
             }
             SecureName = model.SecureName;
             Price = model.Price;
-            Components = model.SecureComponents.ToDictionary(x => x.Key, x =>
-           x.Value.Item2);
+            Components = model.SecureComponents.ToDictionary(x => x.Key, x => x.Value.Item2);
             _secureComponents = null;
         }
         public SecureViewModel GetViewModel => new()