c# - unable to download file from server in asp.net application -

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i having exception when try download file server in asp.net application :

this code :

            try             {                 response.appendheader("content-disposition", "attachment; filename=" + "toto");                 response.transmitfile(server.mappath("fda//toto.txt"));                 response.end();             }             catch (exception ex)             {                 var exception = ex;             }

and exception when debug code , put breakpoint @ "catch exception":

ex = {unable evaluate expression because code optimized or native frame on top of call stack.}

when run code without debuging , no breakpoints, getting :

my code stop in "scriptresource.axd.....acab[dynamic] page @ line "throw error" following visual studio pop :

sys.webforms.pagerequestmanagerparsererrorexception:

and have 3 buttons on pop : break, continue, ignore.


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