contents of downloaded file not appearing

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C#

ASP.NET

please help me i am trying to create zip dynamicaly when user clicks on button and adding files in to it.files are of image,pdf,text audio,video,zip type. i tried following code - it downloads the file in zip folder but contents of file not appearing:

Crc32 crc = new Crc32();

ZipOutputStream s = new ZipOutputStream(File.Create(@"C:\Documents and Settings\admin\My Documents\Downloads\Evidence.zip"));

s.SetLevel(9); // 0 - store only to 9 - means best compression

FileStream fs = File.OpenRead(@"c:\boot.ini");

byte[] buffer = new byte[fs.Length];

fs.Read(buffer, 0, buffer.Length);



if (ds.Tables[0].Rows.Count > 0)
{
    for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
    {
        string fileNamePath = Convert.ToString(ds.Tables[0].Rows[i]["EvidencePath"]);
        string fileNmae = Convert.ToString(ds.Tables[0].Rows[i]["EvidenceName"]);
        ZipEntry entry = new ZipEntry(ZipEntry.CleanName(@fileNmae));

        entry.DateTime = DateTime.Now;
        entry.Comment = "test file";

        entry.ZipFileIndex = i + 1;

        crc.Reset();

        crc.Update(buffer);

        entry.Crc = crc.Value;

        s.PutNextEntry(entry);

        s.Write(buffer, 0, buffer.Length);



    }
    s.Finish();

    s.Close();
    fs.Close();
}

ShowMessageBox("Downloaded....");