A prompt box will appear when downloading the file or it will be displayed directly in the browser.

A friend asked me how to write the pop-up prompt box for downloading. The details are as follows:

The prompt box

string strFile="F:\a.doc";//The path depends on the actual situation.
if(!System.IO.File.Exists(strFile))
{
Response.Write("<script language='javascript'>alert('Sorry, the file does not exist!');</script>");
return;
}
Response.Clear();
Response.ClearHeaders();
Response.Charset = "GB2312";
Response.ContentEncoding =System.Text.Encoding.UTF8;
Response.ContentType = "application/octet-stream";
FileInfo fi=new FileInfo(strFile);
Response.AddHeader("Content-Disposition","attachment; filename=" + HttpUtility.UrlEncode(fi.Name));
Response.AddHeader("Content-Length",fi.Length.ToString());
byte[] tmpbyte=new byte[1024*8];
FileStream fs=fi.OpenRead();
int count;
while((count=fs.Read(tmpbyte,0,tmpbyte.Length))>0)
{
Response.BinaryWrite(tmpbyte);
Response.Flush();
}
fs.Close();
Response.End();

Open directly in the browser
string strFile="F:\a.doc";//The path depends on the actual situation
Response.Clear();
Response.ClearHeaders();
Response.Charset = "GB2312";
Response.ContentEncoding =System.Text.Encoding.UTF8;
Response.ContentType = "application/msword";
Response.WriteFile(strFile);

http://www.cnblogs.com/skylaugh/archive/2006/12/18/596074.html