create zip file in asp.net

[hi_arv]

hi I am create a zip file in asp.net code using ICSharpCode.SharpZipLib.Zip , all thing is properly work but my problem is that when open save as dialog box for downloading and then save it to client machine is properly work but at that time if i click on open button on the save as dailog box then open zipwizard but it have not any file show blank . Plz help me as soon as possible i really need it. thanks in advance arvind