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system.io.stream istream = null;
// buffer to read 10k bytes in chunk:
byte[] buffer = new byte[10000];
// length of the file:
int length;
// total bytes to read:
long datatoread;
// identify the file to download including its path.
string filepath = "downloadfilename";
// identify the file name.
string filename = system.io.path.getfilename(filepath);
try
{
// open the file.
istream = new system.io.filestream(filepath, system.io.filemode.open,
system.io.fileaccess.read,system.io.fileshare.read);
// total bytes to read:
datatoread = istream.length;
response.contenttype = "application/octet-stream";
response.addheader("content-disposition", "attachment; filename=" + filename);
// read the bytes.
while (datatoread > 0)
{
// verify that the client is connected.
if (response.isclientconnected)
{
// read the data in buffer.
length = istream.read(buffer, 0, 10000);
// write the data to the current output stream.
response.outputstream.write(buffer, 0, length);
// flush the data to the html output.
response.flush();
buffer= new byte[10000];
datatoread = datatoread – length;
}
else
{
//prevent infinite loop if user disconnects
datatoread = -1;
}
}
}
catch (exception ex)
{
// trap the error, if any.
response.write("error : " + ex.message);
}
finally
{
if (istream != null)
{
//close the file.
istream.close();
}
}
