1 System.IO.Stream iStream = null;
2
3 // Buffer to read 10K bytes in chunk:
4 byte[] buffer = new Byte[10240];
5
6 // Length of the file:
7 int length;
8
9 // Total bytes to read:
10 long dataToRead;
11
12 // Identify the file to download including its path.
13 string filepath = @"E:\software\SQL Server 2000 Personal Edition.ISO";
14
15 // Identify the file name.
16 string filename = System.IO.Path.GetFileName(filepath);
17
18 try
19 {
20 // Open the file.
21 iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
22 System.IO.FileAccess.Read,System.IO.FileShare.Read);
23 Response.Clear();
24
25 // Total bytes to read:
26 dataToRead = iStream.Length;
27
28 long p = 0;
29 if(Request.Headers["Range"]!=null)
30 {
31 Response.StatusCode = 206;
32 p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
33 }
34 if(p != 0)
35 {
36 Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());
37 }
38 Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString());
39 Response.ContentType = "application/octet-stream";
40 Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));
41
42 iStream.Position = p;
43 dataToRead = dataToRead - p;
44 // Read the bytes.
45 while (dataToRead > 0)
46 {
47 // Verify that the client is connected.
48 if (Response.IsClientConnected)
49 {
50 // Read the data in buffer.
51 length = iStream.Read(buffer, 0, 10240);
52
53 // Write the data to the current output stream.
54 Response.OutputStream.Write(buffer, 0, length);
55
56 // Flush the data to the HTML output.
57 Response.Flush();
58
59 buffer= new Byte[10240];
60 dataToRead = dataToRead - length;
61 }
62 else
63 {
64 //prevent infinite loop if user disconnects
65 dataToRead = -1;
66 }
67 }
68 }
69 catch (Exception ex)
70 {
71 // Trap the error, if any.
72 Response.Write("Error : " + ex.Message);
73 }
74 finally
75 {
76 if (iStream != null)
77 {
78 //Close the file.
79 iStream.Close();
80 }
81 Response.End();
82 }
83