asp.net - is not a valid virtual path error -


this code downloading text file. server.transfer method not able resolve path. giving "is not valid virtual path error"

        string filepath = @"d:/bcpresult/cust_file.t`enter code here`xt";         response.contenttype = "text/plain";         response.appendheader("content-disposition",            "attachment; filename=" + filepath);         response.transmitfile(server.mappath(filepath));         response.end();

please guide me...

if file path not related server not need server.mappath.

also if run code in windows, path separator \, not /.

this code must work:

string filepath = @"d:\bcpresult\cust_file.txt"; response.contenttype = "text/plain"; response.appendheader("content-disposition", "attachment; filename=" + filepath); response.transmitfile(filepath); response.end();

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