downlaod code explanation

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can anyone please explain this code

C#

if (e.CommandName == "download")
            {
                string filename = e.CommandArgument.ToString();
                string path = MapPath("~/Docfiles/" + filename);
                byte[] bts = System.IO.File.ReadAllBytes(path);
                Response.Clear();
                Response.ClearHeaders();
                Response.AddHeader("Content-Type", "Application/octet-stream");
                Response.AddHeader("Content-Length", bts.Length.ToString());
                Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
                Response.BinaryWrite(bts);
                Response.Flush();
                Response.End();
            }

what is command argument, mappath, and also what is this
"Content-Type", "Application/octet-stream"
and also

C#

Response.AddHeader("Content-Length", bts.Length.ToString());
                Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
                Response.BinaryWrite(bts);
                Response.Flush();

Posted 21-Feb-14 7:19am

Diya Ayesa

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Krunal Rohit · Accepted Answer · 2014-02-21T07:52:00

e.CommandName is a command argument, which is associated with any control i.e Button, ImageButton etc.
In addition, you would find CommandName property for these controls while writing the code. So it is nothing but the message(argument) that gets executed when control is clicked.

And about the "Content-Type", "Application/octet-stream" , this is the MIME - Multipurpose Internet Mail Extensions, is an internet standard that is used to describe the contents of various files.
You can see plenty of extension over here[^] with its file type.

-KR