使用c＃in vs在Mysql数据库中插入图像

Question

如何在visual studio 2012中使用c＃在Mysql数据库中插入图像？ 我使用了这段代码，但它有问题，我不知道它是什么？ 另外，我应该在这段代码中放在括号内：

cmd.Parameters.Add(); to save the value as an image.
public partial class Invoices : System.Web.UI.Page
{

  protected void Button1_Click(object sender, EventArgs e)
  {

    MySqlConnection connection = new MySqlConnection("server=localhost; userid=root; password=""; database=admindb; allowuservariables=True");
    MySqlCommand cmd = new MySqlCommand();
    cmd.CommandText = "insert into tablename(invoicesfp) VALUES (@val1)";
    cmd.CommandType = CommandType.Text;
    cmd.Connection = connection;
    cmd.Parameters.Add("val1");
    connection.Open();
    cmd.BeginExecuteNonQuery();
    connection.Close();

    #region fileupload
    string fn = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
    string ret = ChangeName();
    string SaveLocation = Server.MapPath("Invoices") + "\\" + ret;

    try
    {
        FileUpload1.PostedFile.SaveAs(SaveLocation);
    }
    catch (Exception ex)
    {
        if (ex is ArgumentNullException || ex is NullReferenceException)
        {
            throw ex;
        }
    }
    string PicAddress = "~/Invoices/" + ret;

    #endregion
 }

   public static string ChangeName()
  {
    return Guid.NewGuid().ToString("N") + ".jpg";
  }
}