C#

public static DataTable ToDataTable<T>(this IList<T> data)
{
    PropertyDescriptorCollection props =
        TypeDescriptor.GetProperties(typeof(T));
    DataTable table = new DataTable();
    for(int i = 0 ; i < props.Count ; i++)
    {
        PropertyDescriptor prop = props[i];
        table.Columns.Add(prop.Name, prop.PropertyType);
    }
    object[] values = new object[props.Count];
    foreach (T item in data)
    {
        for (int i = 0; i < values.Length; i++)
        {
            values[i] = props[i].GetValue(item);
        }
        table.Rows.Add(values);
    }
    return table;        
}

private void FillGridViewFromDataTable()
       {
           dataGridView.DataSource = m_table;
           dataGridView.Columns["PrinterIP"].HeaderText = "IP כתובת";
           dataGridView.Columns["PrinterIP"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
           dataGridView.Columns["PrinterName"].HeaderText = "מזהה מדפסת";
           dataGridView.Columns["PrinterName"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
           dataGridView.Columns["PrinterConnect"].HeaderText = "מחובר לרשת";
           dataGridView.Columns["PrinterConnect"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
           dataGridView.Columns["PrinterCounter"].HeaderText = "מונה";
           dataGridView.Columns["PrinterCounter"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
           dataGridView.Columns["PrinterPlace"].HeaderText = "מיקום";
           dataGridView.Columns["PrinterPlace"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
           dataGridView.RowHeadersVisible = false;}

//reading from the xml
 private void ReadFromXml()
        {
            List<Printer> PrinterList = new List<Printer>();
            TextReader textReader = new StreamReader("xml\\PrinterDetailsLi.xml");
            XmlSerializer deserializer = new XmlSerializer(typeof(List<Printer>));
            PrinterList = (List<Printer>)deserializer.Deserialize(textReader);
            textReader.Close();

            Ping pingSender = new Ping();
            IPAddress address = IPAddress.Loopback;

            for (int i = 0; i < PrinterList.Count; i++)
            {
                PrinterList PList = new PrinterList();
                //add an xml row to data table
                IPAddress ip = IPAddress.Parse(PrinterList[i].PrinterIP);
                PingReply reply = pingSender.Send(ip,5);
                if (reply.Status == IPStatus.Success)
                {
                    DataRow row = m_table.NewRow();
                    SNMP snmp = new SNMP(PrinterList[i].PrinterIP);
                    string Res = snmp.connectSnmp();
                    row["PrinterConnect"] = "כן";
                    row["PrinterCounter"] = Res;
                    row["PrinterName"] = PrinterList[i].PrinterName;
                    row["PrinterIP"] = PrinterList[i].PrinterIP;
                    m_table.Rows.Add(row);
                    PList.PrintConnect = 1;
                    PList.PrintCounter = Res;
                    PList.PrintIP = PrinterList[i].PrinterIP;
                    PList.PrintName = PrinterList[i].PrinterName;
                    PList.date = DateTime.Today;
                    PrList.Add(PList);
                }
                else
                {
                    DataRow row = m_table.NewRow();
                    row["PrinterConnect"] = "לא";
                    row["PrinterCounter"] = "--";
                    row["PrinterName"] = PrinterList[i].PrinterName;
                    row["PrinterIP"] = PrinterList[i].PrinterIP;
                    row["PrinterPlace"] = PrinterList[i].PrinterPlace;
                    m_table.Rows.Add(row);
                    PList.PrintConnect = 0;
                    PList.PrintCounter = "--";
                    PList.PrintIP = PrinterList[i].PrinterIP;
                    PList.PrintName = PrinterList[i].PrinterName;
                    PList.date = DateTime.Today;
                    PrList.Add(PList);
                }
            }

            XmlSerializer serializer = new XmlSerializer(typeof(List<Printer>));
            TextWriter Pd = new StreamWriter(("xml\\PrinterDetailsLi.xml"));
            serializer.Serialize(Pd, PrinterList);
            Pd.Close();
        }