C#

Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;


try
{

    oXL = new Excel.Application();


    oWB = oXL.Workbooks.Open("C:\\tmp\\plan_udrzby.xlt", 1, false, 5,
     "", "", true, Excel.XlPlatform.xlWindows,
     "\t", false, false, 0, true, 1, 0);

    oSheet = (Excel._Worksheet)oWB.ActiveSheet;
    DataRowView vypis = (DataRowView)machine_OverviewBindingSource.Current;


    MemoryStream ms = new MemoryStream();

    myPictureBox.Image.Save(ms, ImageFormat.Jpeg);
    ms.Seek(0, SeekOrigin.Begin);

    Image img = Image.FromStream(ms);

    System.Windows.Forms.Clipboard.SetDataObject(img);


    //Car
    oSheet.Cells[3, 2] = vypis["Car"];
    //Foto
    oSheet.Cells[6, 2] = ; //Here i dont now 
  }
catch (Exception theException)
{
    String errorMessage;
    errorMessage = "Chyba: ";
    errorMessage = String.Concat(errorMessage, theException.Message);
    errorMessage = String.Concat(errorMessage, " Řádek: ");
    errorMessage = String.Concat(errorMessage, theException.Source);

    MessageBox.Show(errorMessage, "Chyba");
}

public void Page_Load(object e, EventArgs s)
    {
        try
        {
            XmlDocument doc = new XmlDocument();
            byte[] chunk;
            string message;
            string xmlmessage;
            xmlmessage = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
    "<chunk xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"bin.base64\">SSdtIGp1c3QgYSBsaXR0bGUgYml0IGNhdWdodCBpbiB0aGUgbWlkZGxlDQpMaWZlIGlzIGEg" +
    "bWF6ZSBhbmQgbG92ZSBpcyBhIHJpZGRsZQ0KSSBkb24ndCBrbm93IHdoZXJlIHRvIGdvIEkg" +
    "Y2FuJ3QgZG8gaXQgYWxvbmUgSSd2ZSB0cmllZA0KQW5kIEkgZG9uJ3Qga25vdyB3aHkNCg0K" +
    "U2xvdyBpdCBkb3duDQpNYWtlIGl0IHN0b3ANCk9yIGVsc2UgbXkgaGVhcnQgaXMgZ29pbmcg" +
    "dG8gcG9wDQonQ2F1c2UgaXQncyB0b28gbXVjaA0KWWVhaCwgaXQncyBhIGxvdA0KVG8gYmUg" +
    "c29tZXRoaW5nIEknbSBub3QNCg0KSSdtIGEgZm9vbA0KT3V0IG9mIGxvdmUNCidDYXVzZSBJ" +
    "IGp1c3QgY2FuJ3QgZ2V0IGVub3VnaA0KDQpJJ20ganVzdCBhIGxpdHRsZSBiaXQ=</chunk>";
            doc.LoadXml(xmlmessage);
            XmlNode node = doc.SelectSingleNode("chunk");
            chunk = node.Value ;// thi is my error, i wanto to read the value as byte
            Response.Write("sucsess ");
        }
        catch (Exception x)
        {
            Response.Write("error "+x);
        }

    }