c# operation xml file class

class CaoZuoXml
    {
        XmlDocument xmlDoc = null;
        String xmlPath = "";
        public CaoZuoXml(String xmlPath)//The path where the file is located (Directory.GetCurrentDirectory() + @"\data.xml")
        {
            this.xmlPath = xmlPath;
            xmlDoc = new XmlDocument();
            xmlDoc.Load(xmlPath);
        }
        /// <summary>
        /// add node
        /// </summary>
        /// <param name="namestr"></param>
        /// <param name="urlstr"></param>
        public void Add(String str)
        {
            try
            {
                XmlNode root = xmlDoc.SelectSingleNode("root");
                XmlElement name = xmlDoc.CreateElement("node1");
                name.InnerText = str;
                root.AppendChild(name);
                xmlDoc.Save(this.xmlPath);
            }catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
         /// <summary>
         /// delete node
         /// </summary>
         /// <param name="name"></param>
         public Boolean DeleteXml(String name)//Delete according to the incoming node content
         {
             try
             {
                 XmlNode root = xmlDoc.SelectSingleNode("root");
                 XmlNodeList nodelist = xmlDoc.SelectNodes("//node1");
                 for (int i = 0; i < nodelist.Count; i++)
                 {
                     if (nodelist[i].InnerText.Equals(name))
                     {
                         root.RemoveChild(nodelist[i]);
                         xmlDoc.Save(this.xmlPath);
                         return true;
                     }
                 }
                 return false;

             }
             catch(Exception ex)
             {
                 return false;
             }
         }

public DataTable GetXml()//Get the data table of the document
        {
            try
            {
                XmlNodeList list_name = xmlDoc.SelectNodes("//node1");
                DataTable dt = new DataTable("data");
                DataColumn dc = null;
                dc = dt.Columns.Add("col1", Type.GetType("System.String"));
                dc = dt.Columns.Add("col2", Type.GetType("System.String"));
                for (int i = 0; i < list_name.Count; i++)
                {
                    DataRow newRow;
                    newRow = dt.NewRow();
                    String[] text = new String[2];
                    newRow["col1"] = list_name[i].InnerText;
                    newRow["col2"] = " ";
                    dt.Rows.Add(newRow);
                }
                return dt;

            }
            catch(Exception ex)
            {
                return null;
            }
        }