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string connStr = ConfigurationSettings.AppSettings["ConnectionString"];
using(SqlConnection conn = new SqlConnection(connStr))
{
        string sql = "select * from Tb";
        SqlCommand cmd = new SqlCommand(sql, conn);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            byte[] bytes = (byte[])dr["Image"];
            FileStream fs = new FileStream(@"c:\" + dr["ID"] + ".jpg", FileMode.Create, FileAccess.Write)