C# unzip a file: Error with 'Thumbs.db' -

i wrote program unzip file (.zip) using sharpziplib...

the following code:

public void unzip(string zipfilepath, string extractionpath) {      fastzip fz = new fastzip();      fz.extractzip(zipfilepath, extractionpath, null); } 

i following exception:
additional information: access path "c:\program files (x86)\... thumbs.db" refused.
program starts admin rights , file "thumbs.db" not exist in .zip archive.

who knows further?
greets , thanks!

i ignore "thumbs.db" file os file.

maybe this:

using icsharpcode.sharpziplib.core; using icsharpcode.sharpziplib.zip;  public void extractzipfile(string archivefilenamein, string password, string outfolder) {     zipfile zf = null;     try {         filestream fs = file.openread(archivefilenamein);         zf = new zipfile(fs);         if (!string.isnullorempty(password)) {             zf.password = password;     // aes encrypted entries handled automatically         }         foreach (zipentry zipentry in zf) {             if (!zipentry.isfile) {                 continue;           // ignore directories             }             string entryfilename = zipentry.name;             // remove folder entry:- entryfilename = path.getfilename(entryfilename);             // optionally match entrynames against selection list here skip desired.             // unpacked length available in zipentry.size property.              byte[] buffer = new byte[4096];     // 4k optimum             stream zipstream = zf.getinputstream(zipentry);              // manipulate output filename here desired.             string fullziptopath = path.combine(outfolder, entryfilename);             string directoryname = path.getdirectoryname(fullziptopath);             if (directoryname.length > 0)                 directory.createdirectory(directoryname);              // unzip file in buffered chunks. fast unpacking buffer full size             // of file, not waste memory.             // "using" close stream if exception occurs.             using (filestream streamwriter = file.create(fullziptopath)) {                 streamutils.copy(zipstream, streamwriter, buffer);             }         }     } {         if (zf != null) {             zf.isstreamowner = true; // makes close shut underlying stream             zf.close(); // ensure release resources         }     } }