diff --git a/src/Banquale/Banquale/DataContractPersistance/DataContractPersJSON.cs b/src/Banquale/Banquale/DataContractPersistance/DataContractPersJSON.cs
new file mode 100644
index 0000000..85df3fb
--- /dev/null
+++ b/src/Banquale/Banquale/DataContractPersistance/DataContractPersJSON.cs
@@ -0,0 +1,57 @@
+using Model;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.Serialization.Json;
+using System.Text;
+using System.Threading.Tasks;
+
+
+
+namespace Banquale.DataContractPersistance
+{
+    public class DataContractPersJSON : IPersistenceManager
+    {
+
+        public string FilePath { get; set; } = FileSystem.Current.AppDataDirectory;
+        public string FileName { get; set; } = "DataSave.json";
+
+
+        public (List<Customer>, Consultant) DataLoad()
+        {
+            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(DataToPersist));
+
+            DataToPersist data;
+
+            using (FileStream stream2 = File.OpenRead(Path.Combine(FilePath, FileName)))
+            {
+                data = jsonSerializer.ReadObject(stream2) as DataToPersist;
+            }
+
+            return (data.customer, data.consultant);
+
+        }
+
+        public void DataSave(List<Customer> cu, Consultant co)
+        {
+
+            DataToPersist data = new DataToPersist();
+            data.customer = cu;
+            data.consultant = co;
+
+            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(DataToPersist));
+            using (FileStream stream = File.Create(Path.Combine(FilePath, FileName)))
+            {
+                using (var writer = JsonReaderWriterFactory.CreateJsonWriter(
+                            stream,
+                            System.Text.Encoding.UTF8,
+                            false,
+                            true))//<- this boolean says that we sant indentation
+                {
+                    jsonSerializer.WriteObject(writer, data);
+                }
+            }
+        }
+    }
+}
diff --git a/src/Banquale/Banquale/DataContractPersistance/DataContractPersXML.cs b/src/Banquale/Banquale/DataContractPersistance/DataContractPersXML.cs
new file mode 100644
index 0000000..893ee04
--- /dev/null
+++ b/src/Banquale/Banquale/DataContractPersistance/DataContractPersXML.cs
@@ -0,0 +1,107 @@
+using Model;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Runtime.Serialization;
+using System.Xml;
+
+
+namespace Banquale.DataContractPersistance
+{
+	public class DataContractPersXML : IPersistenceManager
+	{
+        //public string FilePath { get; set; } = Environment.GetFolderPath(Environment.SpecialFolder.Personal) + "/datbase.xml";
+
+        public string FilePath { get; set; } = FileSystem.Current.AppDataDirectory;
+		public string FileName { get; set; } = "DataSave.xml";
+
+        public (List<Customer>, Consultant) DataLoad()
+		{
+			var serializer = new DataContractSerializer(typeof(DataToPersist));
+
+			DataToPersist data;
+
+            if (File.Exists(Path.Combine(FilePath, FileName))) // Vérifiez si le fichier existe
+            {
+                using (Stream s = File.OpenRead(Path.Combine(FilePath, FileName)))
+                {
+                    data = serializer.ReadObject(s) as DataToPersist;
+                }
+            }
+            else
+            {
+                data = new DataToPersist(); // Si le fichier n'existe pas, créez une nouvelle liste
+            }
+
+   //         List<Customer> CustomersList;
+			//Consultant Consultant;
+
+			//using (Stream s = File.OpenRead(Path.Combine(FilePath, FileNameCustomer)))
+			//{
+			//	CustomersList = serializer.ReadObject(s) as List<Customer>;
+   //         }
+
+   //         using (Stream s = File.OpenRead(Path.Combine(FilePath, FileNameConsultant)))
+   //         {
+   //             Consultant = serializer2.ReadObject(s) as Consultant;
+   //         }
+
+            return (data.customer, data.consultant);
+		}
+
+		public void DataSave(List<Customer> cu, Consultant co)
+		{
+            var serializer = new DataContractSerializer(typeof(DataToPersist), new DataContractSerializerSettings() { PreserveObjectReferences = true }); 
+            // La deuxième partie sert à faire des références, cela sert à ne pas duppliquer l'écriture de certains attributs
+
+            if (!Directory.Exists(FilePath))
+            {
+                Debug.WriteLine("Directory doesn't exist.");
+                Directory.CreateDirectory(FilePath);
+            }
+
+
+            DataToPersist data = new DataToPersist();
+            data.customer = cu;
+            data.consultant = co;
+
+            var settings = new XmlWriterSettings() { Indent = true };
+            using (TextWriter tw = File.CreateText(Path.Combine(FilePath, FileName)))
+            {
+                using (XmlWriter w = XmlWriter.Create(tw, settings))
+                {
+                    serializer.WriteObject(w, data);
+                }
+            }
+
+
+   //         var serializer = new DataContractSerializer(typeof(List<Customer>));
+   //         var serializer2 = new DataContractSerializer(typeof(Consultant));
+
+   //         if (!Directory.Exists(FilePath))
+			//{
+			//	Debug.WriteLine("Directory created");
+			//	Debug.WriteLine(FilePath);
+			//	Directory.CreateDirectory(FilePath);
+			//}
+
+			//var settings = new XmlWriterSettings() { Indent = true };
+   //         using (TextWriter tw = File.CreateText(Path.Combine(FilePath, FileNameCustomer))) 
+			//{
+			//	using (XmlWriter writer = XmlWriter.Create(tw, settings))
+			//	{
+			//		serializer.WriteObject(writer, cu);
+			//	}
+			//}
+
+   //         using (TextWriter tw2 = File.CreateText(Path.Combine(FilePath, FileNameConsultant)))
+   //         {
+   //             using (XmlWriter writer2 = XmlWriter.Create(tw2, settings))
+   //             {
+   //                 serializer.WriteObject(writer2, co);
+   //             }
+   //         }
+        }
+    }
+}
+