IT’s on FIRE

public static string ExtractFile(string DownloadFileName)
{
    string destFile = "";
    try
    {
        ZipInputStream zipIn = new ZipInputStream(File.OpenRead(DownloadFileName));
        string ExtractToPath = ConfigurationSettings.AppSettings["BackupPath"].ToString() + "\\";
        ExtractToPath = ExtractToPath.Replace("{APPPATH}", AppDomain.CurrentDomain.BaseDirectory);
        ZipEntry entry;
        if ((entry = zipIn.GetNextEntry()) != null) //ONLY ONE FILE
        {
            FileStream streamWriter = File.Create(ExtractToPath + entry.Name);
            long size = entry.Size;
            byte[] data = new byte[size];
            while (true)
            {
                size = zipIn.Read(data, 0, data.Length);
                if (size > 0) streamWriter.Write(data, 0, (int)size);
                else break;
            }
            streamWriter.Close();
            FileInfo fi = new FileInfo(ExtractToPath + entry.Name);
            destFile = ExtractToPath + DateTime.Now.ToString("yyyyMMddHHmmss") + fi.Extension;
            // RENAME FILE
            if (File.Exists(destFile)) File.Delete(destFile);
            File.Move(ExtractToPath + entry.Name, destFile);
        }
    }
    catch
    {
        Console.WriteLine("ERROR: Error while extract zip file.");
    }
    return destFile;
}

POP3_Client pop3 = new POP3_Client();
pop3.Connect("mail.fetag.net", 110, false);
pop3.Authenticate("username", "password", false);
POP3_ClientMessageCollection cmc = pop3.Messages;
foreach (POP3_ClientMessage cm in cmc)
{
    byte[] bytes = cm.MessageToByte();
 
    Mail_Message m = Mail_Message.ParseFromByte(bytes);
    string Subject = m.Subject;
    foreach (MIME_Entity entry in m.Attachments)
    {
        string FileName = entry.ContentDisposition.Param_FileName;
        byte[] data = ((MIME_b_SinglepartBase)entry.Body).Data; 
        FileStream fs = null;
        fs = new FileStream(@"d:\" + FileName, FileMode.Create);
        fs.Write(data, 0, data.Length);
        fs.Close();
    }
}