vb.net - Grdview to excel and save so dialog box does not show -

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i have following code. creates , saves excel file content in grdview4 great. @ end of application displays disalog box not want. there anyways dialog box not show?

        response.contentencoding = system.text.encoding.unicode         response.contenttype = "application/vnd.ms-excel"          '  response.addheader("content-disposition", "attachment;filename=""c:\echobacs\rejectedbacsbacs\rejectedbacs" & newdate & ".xls")          '  response.transmitfile("c:\rejectedbacs" & newdate & ".xls")         response.charset = ""         me.enableviewstate = false         dim ostringwriter new system.io.stringwriter         dim ohtmltextwriter new system.web.ui.htmltextwriter(ostringwriter)         gridview4.headerrow.style.add("background-color", "#ffffff")          gridview4.rendercontrol(ohtmltextwriter)         dim helpme string = ostringwriter.tostring()       '  response.write(ostringwriter.tostring())          ' httpcontext.current.response.end()         file.writealltext("c:\echobacs\rejectedbacs\rejectedbacs" & newdate & ".xls", helpme)          ohtmltextwriter.close()

do not use response in case, ask save dialog box. if want save file disk without prompt this. giving in c#

system.web.ui.webcontrols.datagrid grid = new system.web.ui.webcontrols.datagrid(); grid.headerstyle.font.bold = true; grid.datasource = datatable; grid.datamember = datatable.tablename; grid.databind();  using(streamwriter sw = new streamwriter ("d:\\temp\test.xls"))  {      using (htmltextwriter hw = new htmltextwriter(sw))      {            grid.rendercontrol(hw);      } }

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