急急急！怎么把数据库的img提出为string或者txt
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace GetImage
{
    class Program
    {
        static void Main(string[] args)
        {
            private void GetImage()
            {
                string conn ="Server=(local);User id =sa;Pwd =huiheng518;dataset =test";
                SqlConnection sqlCon = new Sqlconnection(conn);
                string sql = "SELECT id,pic From Piclist where id=1";
                SqlCommand myCommand = new SqlCommand();
                myCommand.Connection = sqlCon;
                myCommand.CommandType = CommandType.Text;
                myCommand.CommandText = sql;
                DataTable myTable = new DataTable();
                SqlDataAdapter myDataAda = new SqlDataAdapter();
                myDataAda.SelectCommand = myCommand;
                try
                {
                sqlCon.Open();
                myDataAda.Fill(myTable);
                sqlCon.Close();
                    if(myTable.Rows.Count>0)
                    {
                    byte[] image = (byte[])myTable.Row[0]["ImageFile"];
                    string ll = Encoding.Default.GetString(image);
                        WriteStr(@"F:\test.txt",ll);
                    }
                }
                catch(Exception ex)
                {