diff --git a/exeinfogui/PanelHexDump.xeto.cs b/exeinfogui/PanelHexDump.xeto.cs
index dc83134..677feca 100644
--- a/exeinfogui/PanelHexDump.xeto.cs
+++ b/exeinfogui/PanelHexDump.xeto.cs
@@ -1,9 +1,31 @@
-using System;
-using System.Collections.Generic;
-using System.Data;
-using System.Net.Sockets;
+//
+// PanelHexDump.xeto.cs
+//
+// Author:
+//       Natalia Portillo <claunia@claunia.com>
+//
+// Copyright (c) 2017-2018 Copyright © Claunia.com
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System.Text;
 using Eto.Forms;
-using Eto.Drawing;
 using Eto.Serialization.Xaml;
 
 namespace exeinfogui
@@ -11,6 +33,7 @@ namespace exeinfogui
     public class PanelHexDump : Panel
     {
         TextArea txtHexDump;
+
         public PanelHexDump()
         {
             XamlReader.Load(this);
@@ -19,11 +42,14 @@ namespace exeinfogui
         public void Update(byte[] data)
         {
             txtHexDump.Text = "";
+            StringBuilder sb = new StringBuilder();
             for(long pos = 0; pos < data.LongLength; pos++)
             {
-                if(pos > 0 && pos % 4 == 0) txtHexDump.Text += " ";
-                txtHexDump.Text += $"{data[pos]:X2} ";
+                if(pos > 0 && pos % 4 == 0) sb.Append(" ");
+                sb.Append($"{data[pos]:X2} ");
             }
+
+            txtHexDump.Text = sb.ToString();
         }
     }
-}
+}
\ No newline at end of file