c# - How to save the exported Excel file in client place? -

i have exported data excel using microsoft.office.interop.excel dll working fine downloading in server location not in client location. how can download file in client location. here code have used exporting excel , how can ask location save excel file .

dataset dscolors = objclscorp.getblockcolorsforreport();         if (dsreport.tables.count > 0 && dscolors.tables.count > 0)         {             application excelapp = new application();             workbook excelworkbook = null;             worksheet excelworksheet = null;             excelapp.visible = true;             excelworkbook = excelapp.workbooks.add(xlwbatemplate.xlwbatworksheet);              (int = 1; < dscolors.tables[0].rows.count; i++)             {                 excelworkbook.worksheets.add(); //adding new sheet in excel workbook             }              (int = 0; < dscolors.tables[0].rows.count; i++)             {                 int r = 1; // initialize excel row start position  = 1                 excelworksheet = (microsoft.office.interop.excel.worksheet)excelworkbook.worksheets[i + 1];                 //writing columns name in excel sheet                 (int col = 1; col <= dsreport.tables[0].columns.count; col++)                 {                     excelworksheet.cells[r, col] = dsreport.tables[0].columns[col - 1].columnname;                 }                 r++;                  system.data.datatable table = dsreport.tables[0];                 if (table.rows.count > 0)                 {                     table.defaultview.rowfilter = "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring()+"'";                     table = table.defaultview.totable();                      //writing rows excel sheet                     (int row = 0; row < table.rows.count; row++) //r stands excelrow , col excelcolumn                     {                         // excel row , column start positions writing row=1 , col=1                         (int col = 1; col <= table.columns.count; col++)                         {                             excelworksheet.cells[r, col] = table.rows[row][col - 1].tostring();                         }                         r++;                     }                 }                                    if (table.rows.count > 0)                 {                     int totalstock = 0;                     decimal totalbqtysft = 0;                     int totaltodaymarked = 0;                     decimal totalmqtysft = 0;                     int totalmarked = 0;                     decimal totaltmqtysft = 0;                     int totalbalancenos = 0;                     decimal totalgrandqtysft = 0;                      totalstock = convert.toint32(table.compute("sum(stock)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totalbqtysft = convert.todecimal(table.compute("sum(bqtysft)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totaltodaymarked = convert.toint32(table.compute("sum(todaymarked)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totalmqtysft = convert.todecimal(table.compute("sum(mqtysft)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totalmarked = convert.toint32(table.compute("sum(totalmarked)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totaltmqtysft = convert.todecimal(table.compute("sum(tmqtysft)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totalbalancenos = convert.toint32(table.compute("sum(balancenos)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                     totalgrandqtysft = convert.todecimal(table.compute("sum(grandqtysft)", "color = '" + dscolors.tables[0].rows[i]["blockcolor"].tostring() + "'"));                      (int col = 1; col <= table.columns.count; col++)                     {                         excelworksheet.cells[r, col] = "";                     }                     r++;                      (int col = 1; col <= table.columns.count; col++)                     {                         if (table.columns[col - 1].columnname == "stock")                         {                             excelworksheet.cells[r, col] = totalstock.tostring();                         }                         if (table.columns[col - 1].columnname == "bqtysft")                         {                             excelworksheet.cells[r, col] = totalbqtysft.tostring();                         }                         if (table.columns[col - 1].columnname == "todaymarked")                         {                             excelworksheet.cells[r, col] = totaltodaymarked.tostring();                         }                         if (table.columns[col - 1].columnname == "mqtysft")                         {                             excelworksheet.cells[r, col] = totalmqtysft.tostring();                         }                         if (table.columns[col - 1].columnname == "totalmarked")                         {                             excelworksheet.cells[r, col] = totalmarked.tostring();                         }                         if (table.columns[col - 1].columnname == "tmqtysft")                         {                             excelworksheet.cells[r, col] = totaltmqtysft.tostring();                         }                         if (table.columns[col - 1].columnname == "balancenos")                         {                             excelworksheet.cells[r, col] = totalbalancenos.tostring();                         }                         if (table.columns[col - 1].columnname == "grandqtysft")                         {                             excelworksheet.cells[r, col] = totalgrandqtysft.tostring();                         }                     }                     r++;                 }                  try                 {                     excelworksheet.name = dscolors.tables[0].rows[i]["abbreviation"].tostring();//renaming excelsheets                 }                 catch (exception ex)                 {                     excelworksheet.name = dscolors.tables[0].rows[i]["abbreviation"].tostring() + string.format("{0:d}", math.abs(i - datetime.now.millisecond));                 }              }             string filepath = "c:\\netstockreport\\";             if (!directory.exists(filepath))             {                 directory.createdirectory(filepath);             }             string filename = filepath+"netstockreport" + datetime.now.tostring("dd-mm-yyyy-hh-mm-ss")+".xlsx";             excelworkbook.saveas(filename);                            excelworkbook.close();             excelapp.quit();             marshal.releasecomobject(excelworksheet);             marshal.releasecomobject(excelworkbook);             marshal.releasecomobject(excelapp);         } 

thanks, purna.

using (memorystream memorystream = new memorystream())         {             using (var writer = new streamwriter(memorystream))             {                 // code write file content             }             string filename = "yourfilename.csv";             httpcontext.current.response.clear();             httpcontext.current.response.contenttype = "text/csv";             httpcontext.current.response.addheader("content-disposition", "attachment;filename=" + filename);             httpcontext.current.response.cache.setcacheability(httpcacheability.nocache);             httpcontext.current.response.binarywrite(memorystream.toarray());             httpcontext.current.response.end();         }