C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Common.Logging;
using System.IO;

namespace sample1
{
    public class Helper1
    {
        private static ILog log = LogManager.GetCurrentClassLogger();

        public Customer createCust(String CustId, String fileName)
        {

            Customer cst = new Customer();
            byte[] buffer = null;
            try
            {
                
                System.IO.FileStream fileStream = new System.IO.FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);

                System.IO.BinaryReader binaryReader = new System.IO.BinaryReader(fileStream);

                long totalBytes = new System.IO.FileInfo(fileName).Length;

                buffer = binaryReader.ReadBytes((Int32)totalBytes);

                DateTime attachmentId = DateTime.Now;
                cst.Id = attachmentId.ToString();
                cst.MimeType = getMimeType(fileName);
                cst.Value = buffer;
                fileStream.Close();
                binaryReader.Close();
            }
            catch (Exception e)
            {

                throw new Exception(e.Message);
            }

            return cust;
        }
}}