My xml create new verion on my Desktop

[SAMARM]

Good Day

I am creating my first internet explore add-in , my add-in combine between SR and TTS, the user will say any word and if the word in xml file the add-in will generate URL if not the add-in will display error MSG , also the user can add new word to xml file . the problem that I am facing now when setup my add-in and run it on internet explore error msg display and when click continue the new version of xml file will create on my desktop ,I saved xml file in debug file .

try
            {
                XmlTextWriter writer = new XmlTextWriter("Grammar.xml", Encoding.UTF8);
                writer.Formatting = Formatting.Indented;
 
                writer.WriteStartDocument();
                writer.WriteStartElement("grammar");
                writer.WriteAttributeString("xmlns", "http://www.w3.org/2001/06/grammar");
                writer.WriteAttributeString("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
                writer.WriteAttributeString("xml:lang", "en-US");
                writer.WriteAttributeString("version", "1.0");
                writer.WriteAttributeString("root", "command1");
                writer.WriteStartElement("rule ");
                writer.WriteAttributeString("id", "command1");
                writer.WriteAttributeString("scope", "public");
                writer.WriteStartElement("one-of");
 
 
                foreach (string item in listBox1.Items)
                {
                    writer.WriteStartElement("item");
                    writer.WriteString(item);
                    writer.WriteEndElement(); //WORD
                }
 
                writer.WriteEndElement(); //COMMAND
                writer.WriteEndElement();
                writer.WriteEndElement();
                writer.WriteEndDocument();// End Document
 
                writer.Close();
                MessageBox.Show("THE NEW WORDS ADD TO THE XML FILE !!", "Message");
            }

Thank u