diff --git a/AirplaneWithRadar/ProjectAirplaneWithRadar/CollectionGenericObjects/StorageCollection.cs b/AirplaneWithRadar/ProjectAirplaneWithRadar/CollectionGenericObjects/StorageCollection.cs
index 2935ca3..81db8f9 100644
--- a/AirplaneWithRadar/ProjectAirplaneWithRadar/CollectionGenericObjects/StorageCollection.cs
+++ b/AirplaneWithRadar/ProjectAirplaneWithRadar/CollectionGenericObjects/StorageCollection.cs
@@ -1,4 +1,5 @@
-using System.Text;
+using System.IO;
+using System.Text;
 using ProjectAirplaneWithRadar.Drawnings;
 
 namespace ProjectAirplaneWithRadar.CollectionGenericObjects
@@ -103,24 +104,25 @@ namespace ProjectAirplaneWithRadar.CollectionGenericObjects
                 return false;
 
             if(File.Exists(filename))
-                File.Delete(filename);
+                File.Delete(filename);            
 
-            StringBuilder sb = new();
-
-            sb.Append(_collectionKey);
-            foreach(KeyValuePair<string, ICollectionGenericObjects<T>> value in _storages)
+            using FileStream fs = new(filename, FileMode.Create);
+            using StreamWriter sw = new StreamWriter(fs);
+            sw.Write(_collectionKey);
+            foreach (KeyValuePair<string, ICollectionGenericObjects<T>> value in _storages)
             {
-                sb.Append(Environment.NewLine);
-
+                sw.Write(Environment.NewLine);
                 if (value.Value.Count == 0)
+                {
                     continue;
+                }
 
-                sb.Append(value.Key);
-                sb.Append(_separatorForKeyValue);
-                sb.Append(value.Value.GetCollectionType);
-                sb.Append(_separatorForKeyValue);
-                sb.Append(value.Value.MaxCount);
-                sb.Append(_separatorForKeyValue);
+                sw.Write(value.Key);
+                sw.Write(_separatorForKeyValue);
+                sw.Write(value.Value.GetCollectionType);
+                sw.Write(_separatorForKeyValue);
+                sw.Write(value.Value.MaxCount);
+                sw.Write(_separatorForKeyValue);
 
                 foreach (T? item in value.Value.GetItems())
                 {
@@ -130,14 +132,10 @@ namespace ProjectAirplaneWithRadar.CollectionGenericObjects
                         continue;
                     }
 
-                    sb.Append(data);
-                    sb.Append(_separatorItems);
+                    sw.Write(data);
+                    sw.Write(_separatorItems);
                 }
             }
-
-            using FileStream fs = new(filename, FileMode.Create);
-            byte[] info = new UTF8Encoding(true).GetBytes(sb.ToString());
-            fs.Write(info, 0, info.Length);
             return true;
         }
 
@@ -153,59 +151,51 @@ namespace ProjectAirplaneWithRadar.CollectionGenericObjects
                 return false;
             }
 
-            string bufferTextFromFile = "";
             using (FileStream fs = new(filename, FileMode.Open))
             {
-                byte[] b = new byte[fs.Length];
-                UTF8Encoding temp = new(true);
-                while (fs.Read(b, 0, b.Length) > 0)
-                {
-                    bufferTextFromFile += temp.GetString(b);
-                }
-            }
+                using StreamReader sr = new StreamReader(fs);
 
-            string[] strs = bufferTextFromFile.Split(new char[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);
-            if (strs == null || strs.Length == 0)
-            {
-                return false;
-            }
-
-            if (!strs[0].Equals(_collectionKey))
-            {
-                return false;
-            }
-
-            _storages.Clear();
-            foreach (string data in strs)
-            {
-                string[] record = data.Split(_separatorForKeyValue, StringSplitOptions.RemoveEmptyEntries);
-                if (record.Length != 4)
-                {
-                    continue;
-                }
-
-                CollectionType collectionType = (CollectionType)Enum.Parse(typeof(CollectionType), record[1]);
-                ICollectionGenericObjects<T>? collection = StorageCollection<T>.CreateCollection(collectionType);
-                if (collection == null)
+                string str = sr.ReadLine();
+                if (str == null || str.Length == 0)
                 {
                     return false;
                 }
 
-                collection.MaxCount = Convert.ToInt32(record[2]);
-
-                string[] set = record[3].Split(_separatorItems, StringSplitOptions.RemoveEmptyEntries);
-                foreach (string elem in set)
+                if (!str.Equals(_collectionKey))
                 {
-                    if (elem?.CreateDrawningAirplane() is T airplane)
-                    {
-                        if (collection.Insert(airplane) == -1)
-                            return false;
-                    }
+                    return false;
                 }
+                _storages.Clear();
 
-                _storages.Add(record[0], collection);
+                while (!sr.EndOfStream)
+                {
+                    string[] record = sr.ReadLine().Split(_separatorForKeyValue, StringSplitOptions.RemoveEmptyEntries);
+                    if (record.Length != 4)
+                    {
+                        continue;
+                    }
+
+                    CollectionType collectionType = (CollectionType)Enum.Parse(typeof(CollectionType), record[1]);
+                    ICollectionGenericObjects<T>? collection = StorageCollection<T>.CreateCollection(collectionType);
+                    if (collection == null)
+                    {
+                        return false;
+                    }
+
+                    collection.MaxCount = Convert.ToInt32(record[2]);
+
+                    string[] set = record[3].Split(_separatorItems, StringSplitOptions.RemoveEmptyEntries);
+                    foreach (string elem in set)
+                    {
+                        if (elem?.CreateDrawningAirplane() is T airplane)
+                        {
+                            if (collection.Insert(airplane) == -1)
+                                return false;
+                        }
+                    }
+                    _storages.Add(record[0], collection);
+                }
             }
-
             return true;
         }