c# - asp net error the process cannot access the file because it is being used -

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i have error regards subject above, downloading file path. download code this:

string sfile = request.querystring["rfbnumber"].tostring(); string sfile2 = request.querystring["foldername"].tostring(); string sflag = request.querystring["flag"].tostring();  //createrfbreport(sfile, sfile2); //createsinglefile(sfile2, sfile); if (sflag == "1") {     sfilename = "rfb_" + sfile + "_collated.pdf";     sglobalfoldername = sfile2;     sfilepath = @ "" + sglobalfoldername + "\\" + sfilename;      webclient client = new webclient();     byte[] buff = client.downloaddata(sfilepath);     response.contenttype = "application/pdf";     response.addheader("content-length", buff.length.tostring());     response.binarywrite(buff); } if (sflag == "2") {     sfilename = "sop_" + sfile + "_collated.pdf";     sglobalfoldername = sfile2;     sfilepath = @ "" + sglobalfoldername + "\\" + sfilename;      webclient client = new webclient();     byte[] buff = client.downloaddata(sfilepath);     response.contenttype = "application/pdf";     response.addheader("content-length", buff.length.tostring());     response.binarywrite(buff); }

i have refresh page multiple times before can download item, having error on line byte[] buff = client.downloaddata(sfilepath);

can me please? been searching way solve issue. thank in advance.


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