asp.net - How to set MIME type for uploaded file? -


i wrote code upload file database using asp.net , c# . // part binary data , file name , mime type 

string filename = path.getfilename(uploadcontract.filename);         if (filename != string.empty)         {             string conttype = uploadcontract.postedfile.contenttype;             stream str = uploadcontract.postedfile.inputstream;             binaryreader br = new binaryreader(str);             byte[] size = br.readbytes((int)str.length);             return size;         }         else         {            //         }

after saving file in database name , mime type . tried download same file code 

 sqlcommand selectcmd = new sqlcommand();     sqlconn = new sqlconnection((string)viewstate["connstr"]);     selectcmd.commandtext = @"select    tbl_files_filename,tbl_files_filecontent,tbl_files_filemime             tbl_files            seq=@sq";     selectcmd.connection = sqlconn;     selectcmd.parameters.addwithvalue("sq", convert.toint64(request.querystring["id"]));     selectcmd.commandtype = commandtype.text;     sda.selectcommand = selectcmd;     int itemin = sda.fill(ds, "downfile");     sqlconn.close();     if (itemin != 0)     {             byte[] byt = (byte[])ds.tables["downfile"].rows[0]["tbl_files_filecontent"];             httpcontext.current.response.clear();             httpcontext.current.response.contenttype = ds.tables["downfile"].rows[0]["tbl_files_filemime"].tostring();             httpcontext.current.response.addheader("content-disposition", "attachment;filename=" + ds.tables["downfile"].rows[0]["tbl_files_filename"].tostring());             httpcontext.current.response.charset = "";             httpcontext.current.response.cache.setcacheability(httpcacheability.nocache);             httpcontext.current.response.binarywrite(byt);             httpcontext.current.applicationinstance.completerequest();     }

but faced following problem

excel found unreadable content in "test.xlsx".do want recover contents of workbook? if trust source of workbook, click yes.

it there problem type of file


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