Saving-Rebuilding InkCanvas Strokes

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.OracleClient;

namespace WindowsApplication2
{
    class Signature
    {

        /// <summary>
        /// Inserts a BLOB into an Oracle DataBase
        /// </summary>
        /// <param name="connectionString">The ConnectionString to the database</param>
        /// <param name="signatureBytes">Signature bytes to be saved</param>
        public static void UploadImage(string connectionString, byte[] signatureBytes)
		{
            try
            {
                OracleConnection conn = new OracleConnection(connectionString);
			    conn.Open() ; 

			    OracleCommand cmd = new OracleCommand("insert into tabel(Signature) values(:Signature)", conn); 
                //OracleCommand cmd = new OracleCommand("update courrierlog set Signature=:Signature where id = 312", conn); 
			    cmd.Parameters.Add("Signature", OracleType.Blob) ;
			    cmd.Parameters["Signature"].Value = signatureBytes;
    			
			    cmd.ExecuteNonQuery();
    			
			    conn.Close(); 
            }
            catch(Exception ex)
            {
                throw ex;
            }
		}

		
		/// <summary>
		/// Downloads a byte[] from a BLOB
		/// </summary>
		/// <param name="connectionString"></param>
		/// <returns></returns>		
		public static byte[] DownloadImage(string connectionString)
		{
            try
            {
			    OracleConnection conn = new OracleConnection(connectionString);
			    conn.Open();			

			    OracleCommand cmd = new OracleCommand("select signature from tabel order by id desc", conn); 
                //OracleCommand cmd = new OracleCommand("select signature from courrierlog where id = 312", conn); 
			    byte[] barrImg = cmd.ExecuteScalar() as byte [];

			    conn.Close();

			    return barrImg;
            }
            catch(Exception ex)
            {
                throw ex;
            }
		}
    }

    
}