diff --git a/ConfigEditor/MainForm.cs b/ConfigEditor/MainForm.cs
index 2ea3b0b..4874229 100644
--- a/ConfigEditor/MainForm.cs
+++ b/ConfigEditor/MainForm.cs
@@ -8,49 +8,70 @@ namespace ConfigEditor
 {
     public partial class MainForm: Form
     {
-        private string opened_file = null;
+        private string opened_file_path = null;
+        private string[] original_file_data = null;
 
         public MainForm()
         {
             InitializeComponent();
         }
 
+        private void ClearData()
+        {
+            opened_file_path = null;
+            if (original_file_data != null)
+                Array.Clear(original_file_data, 0, original_file_data.Length);
+            richTextBox1.Clear();
+            ActiveForm.Text = "SaveWizard Config Editor";
+        }
+
         private void openToolStripMenuItem_Click(object sender, EventArgs e)
         {
+            if (!IsModificationSaved())
+                return;
+            ClearData();
             OpenFileDialog ofd = new OpenFileDialog()
             {
-                Title = "Выберите файл конфигурации",
-                Filter = "Файл *.json|*.json",
+                Title = "Choose configuration file",
+                Filter = "File *.json|*.json",
                 Multiselect = false
             };
             if (ofd.ShowDialog() == DialogResult.OK)
             {
-                opened_file = ofd.FileName;
+                opened_file_path = ofd.FileName;
+                original_file_data = File.ReadAllLines(ofd.FileName);
                 richTextBox1.Text = File.ReadAllText(ofd.FileName);
+                ActiveForm.Text = $"{ofd.FileName} - SaveWizard Config Editor";
             }
         }
 
         private void saveToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            File.WriteAllText(opened_file, richTextBox1.Text);
+            if (opened_file_path == null)
+                return;
+            File.WriteAllText(opened_file_path, richTextBox1.Text);
         }
 
         private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
         {
             SaveFileDialog sfd = new SaveFileDialog
             {
-                Title = "Сохранить файл конфигурации",
-                Filter = "Файл *.json|*.json"
+                Title = "Save configuration file",
+                Filter = "File *.json|*.json"
             };
             if (sfd.ShowDialog() == DialogResult.OK)
+            {
                 File.WriteAllText(sfd.FileName, richTextBox1.Text);
+                opened_file_path = sfd.FileName;
+                ActiveForm.Text = $"{sfd.FileName} - SaveWizard Config Editor";
+            }
         }
 
         private void generateMD5ToolStripMenuItem_Click(object sender, EventArgs e)
         {
             using (var md5 = MD5.Create())
             {
-                using (FileStream stream = File.OpenRead(opened_file))
+                using (FileStream stream = File.OpenRead(opened_file_path))
                     md5.ComputeHash(stream);
                 
                 StringBuilder sb = new StringBuilder();
@@ -63,44 +84,57 @@ namespace ConfigEditor
             }
         }
 
-        private bool CheckChanges()
+        private bool IsModificationSaved()
         {
-            if (opened_file != null)
+            if (opened_file_path == null)
+                return true;
+            bool isDataEquals = true;
+            string[] rtbLines = richTextBox1.Text.Split(
+                new[] { "\r\n", "\r", "\n" },
+                StringSplitOptions.None
+            );
+            for (int i = 0; i < original_file_data.Length; i++)
             {
-                if (richTextBox1.Text != File.ReadAllText(opened_file))
+                if (rtbLines[i] != original_file_data[i])
                 {
-                    DialogResult result = MessageBox.Show("The document has been modified.\nDo you want to save your changes?", "Question", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
-                    if (result == DialogResult.Yes)
-                    {
-                        File.WriteAllText(opened_file, richTextBox1.Text);
-                        MessageBox.Show("File successfully saved.", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
-                        return true;
-                    }
-                    else if (result == DialogResult.Cancel)
-                        return false;
+                    isDataEquals = false;
+                    break;
                 }
             }
-            return true;
+            if (isDataEquals)
+            {
+                return true;
+            }
+            DialogResult result = MessageBox.Show("The document has been modified.\nDo you want to save your changes?", "Question", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
+            if (result == DialogResult.Yes)
+            {
+                File.WriteAllText(opened_file_path, richTextBox1.Text);
+                MessageBox.Show("File successfully saved.", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                return true;
+            } else if (result == DialogResult.No)
+                return true;
+            else if (result == DialogResult.Cancel)
+                return false;
+            return false;
         }
 
         private void closeFileToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            if (!CheckChanges())
+            if (!IsModificationSaved())
                 return;
-            richTextBox1.Clear();
-            opened_file = null;
+            ClearData();
         }
 
         private void closeToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            if (!CheckChanges())
+            if (!IsModificationSaved())
                 return;
             Application.Exit();
         }
 
         private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
         {
-            if (!CheckChanges())
+            if (!IsModificationSaved())
                 return;
             Application.Exit();
         }