selam arkadaşlar asp den şifre nasıl oluşturabilir

selam arkadaşlar asp den şifre nasıl oluşturabilirim???

using ICSharpCode.SharpZipLib.Zip;
using System.IO;
ZipOutputStream zos = null;
protected void Button1_Click(object sender, EventArgs e)
{
  string[] pathCollection = new string[2];
  PathCellction[0] = "c:\\folder1";
  PathCellction[1] = "c:\\folder2";
  StartZip(pathCollection, "filename");
}
protected void StartZip(string[] pathCollection, string strFileName)
{
  MemoryStream ms;
  Response.ContentType = "application/octet-stream";  strFileName = HttpUtility.UrlEncode(strFileName).Replace('+', ' ');
  Response.AddHeader("Content-Disposition", "attachment; filename=" + strFileName + ".zip");
  ms = new MemoryStream();
  zos = new ZipOutputStream(ms);
  addZipEntry(pathCollection);
  ms.Close();
  zos.Finish();
  zos.Close();
  Response.Clear();
  Response.BinaryWrite(ms.ToArray());
  Response.End();
}
protected void addZipEntry(string[] pathCollection)
{
  for (int i = 0; i < pathCollection.Length; i++)
  {
    string strPath = pathCollection;
    addZipEntry(strPath, strPath.LastIndexOf("\\") + 1);
  }
}
protected void addZipEntry(string strPath, int baseIndex)
{
  DirectoryInfo di = new DirectoryInfo(strPath);
  foreach (DirectoryInfo item in di.GetDirectories())
  {
    addZipEntry(item.FullName, baseIndex);
  }
  foreach (FileInfo item in di.GetFiles())
  {
    FileStream fs = File.OpenRead(item.FullName);
    byte[] buffer = new byte[fs.Length];
    fs.Read(buffer, 0, buffer.Length);
    string strEntryName = item.FullName.Remove(0, baseIndex);
    ZipEntry entry = new ZipEntry(strEntryName);
    zos.PutNextEntry(entry);