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Server/Data/CustomerData.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Server.Model;
+
+namespace Server.Data
+{
+    public class CustomerData
+    {
+        #region Public Properties
+
+        public List<Address> Customers { get; set; } = [];
+
+        public static CustomerData Instance { get; set; } = new();
+
+        #endregion
+
+        #region Private Properties
+
+        private static string FileName => "Customers.json";
+
+        #endregion
+
+        #region Public Method LoadAsync
+
+        /// <summary>
+        ///     Loads customer data asynchronously from a JSON file if it exists.
+        /// </summary>
+        /// <return>
+        ///     A Task representing the asynchronous operation.
+        /// </return>
+        public static async Task LoadAsync()
+        {
+            if (!File.Exists(FileName)) return;
+            var jsonString = await File.ReadAllTextAsync(FileName);
+            var deserialized = JsonSerializer.Deserialize<CustomerData>(jsonString)!;
+
+            Instance = deserialized;
+        }
+
+        #endregion
+
+        #region Public Method SaveAsync
+
+        /// <summary>
+        ///     Saves the current customer data asynchronously to a JSON file.
+        /// </summary>
+        /// <return>
+        ///     A Task representing the asynchronous operation.
+        /// </return>
+        public static async Task SaveAsync()
+        {
+            var jsonString = JsonSerializer.Serialize(Instance, new JsonSerializerOptions { WriteIndented = true, DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
+            await File.WriteAllTextAsync(FileName, jsonString);
+        }
+
+        #endregion
+    }
+}