How i can make the code execute after file finish downloading

Hi,
i have a code that downloads a file
then some code after , my problem is that code after does not wait to the file finish downloading
how i can achieve that
code is:
String contentType = "application/x-download" ;
FacesContext fc = FacesContext.getCurrentInstance();
HttpServletResponse response =
(HttpServletResponse)fc.getExternalContext().getResponse();
response.setHeader("Content-Disposition",
"attachment; filename=" + l_patch_name + ".zip");
response.setContentType(contentType);
try
FileInputStream fis=new FileInputStream("c:\\patches\\"+ l_patch_name + ".zip");
OutputStream os= response.getOutputStream();
int byteRead;
while(-1 != (byteRead = fis.read()))
os.write(byteRead);
os.close();
if (fis != null)
fis.close();
catch(Exception e){
DisplayMessage("Error in downloading the file");
// now update the token
OperationBinding operationBinding2 =
bindings.getOperationBinding("UpdateTokenField");
String UpdateTokenResult = (String)operationBinding2.execute();
DisplayMessage(UpdateTokenResult);
// now refresh the table
OperationBinding operationBinding3 =
bindings.getOperationBinding("RefreshPatches");
Object result3 = operationBinding3.execute();

Hi,
the above code is excuted succesfully, but if i have
return "Navigation" ;
it is not working
any idea why??????????

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How i can make the code execute after file finish downloading

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