How to download Document programmatically in SharePoint?

I wanted to have a link when user clicked, it allow user to download document from SharePoint Document Library.

The link will be placed inside an aspx page.

I tried the function below:

Response.ContentType = "application/xls";
Response.AppendHeader("Content-Disposition", "attachment; filename=abc.xls");
Response.TransmitFile(Server.MapPath("~/abc.xls"));
Response.End();

It allow me to download开发者_C百科 the document successfully, but the downloaded document cannot open.

what is the better way to do this?

Appreciate if you could provide me some references, thank you.

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For your title, Javascript can get the contents of a web.config through an XMLHTTPRequest to the server, where the server is sending that file. Of course, that's a security risk and I can't think of any reason a person would want to do that.

As for you Excel file, I would suggest using a Content-Type of "application/octet-stream" for binary responses. The browser will then simply save the binary content under the specified file name and let the program (in this case, Excel) take care of interpretting it.