Source.aspx?id=15 // returns 01_myfile.mp3
Source.aspx?id=37 // returns 02_something.flac
Source.aspx?id=3 // returns 03_anotherone.ogg

...
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.StatusCode = (Int32) HttpStatusCode.PartialContent;
Response.AddHeader("Accept-Ranges", "bytes");
Response.AddHeader("Content-Disposition", $"inline; filename="{file.FullName}"");
Response.AddHeader("Content-Length", fileLength.ToString()); // e.g. 100
Response.AddHeader("Content-Range", $"{rangeFrom}-{rangeTo - 1}/{fileLength}"); // e.g. 0-99/100
Response.ContentType = GetContentType(file); // e.g. "audio/mpeg"
String contentDuration = t.Duration?.ToString() ?? "360"; // duration of the audio file or some default guess
Response.AddHeader("X-Content-Duration", contentDuration);
Response.AddHeader("Content-Duration", contentDuration);
Response.TransmitFile(file.FullName, rangeFrom, rangeTo - rangeFrom); // transmit requested section
Response.End();

Request URL:...Source.aspx?id=17686
Request Method:GET
Status Code:206 Partial Content
Remote Address:[::1]:51000
Referrer Policy:no-referrer-when-downgrade
Response Headers
view source
Accept-Ranges:bytes
Cache-Control:private
Content-Disposition:inline; filename="Z:music...mymusicfile.mp3"
Content-Duration:360
Content-Length:12683228
Content-Range:0-12683227/12683228
Content-Type:audio/mpeg
Date:Tue, 12 Dec 2017 15:33:23 GMT
Server:Microsoft-IIS/10.0
X-AspNet-Version:4.0.30319
X-Content-Duration:360
X-Powered-By:ASP.NET
X-SourceFiles:=?UTF-8?B?...?=
Request Headers
view source
Accept:*/*
Accept-Encoding:identity;q=1, *;q=0
Accept-Language:en-US,en;q=0.9
Connection:keep-alive
Cookie:.ASPXAUTH=...
Host:localhost:51000
Range:bytes=0-
Referer:...
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36
Query String Parameters
view source
view URL encoded
id:17686