Unable to execute Click Event after Importing DataTable to Excel

hi,

i have use code on import datatable  excel, when download or cancel download. click event wont run.
how can solve error?

            stringwriter writer = null;              htmltextwriter writer2 = null;              contentbinder ccontentbinder = new contentbinder();                string filename = "usage , role report";                datagrid exportgrid = new datagrid();              datatable dtexcel = new datatable();              //dtexcel = ccontentbinder.createdatatable();              dtexcel = ccontentbinder.getlastlogindate();              exportgrid.datasource = dtexcel;              exportgrid.databind();              exportgrid.font.name = "arial";              exportgrid.font.size = new fontunit("9pt");              exportgrid.headerstyle.font.bold = true;              exportgrid.headerstyle.font.size = new fontunit("10pt");              exportgrid.headerstyle.backcolor = color.lightgray;              exportgrid.bordercolor = color.lightgray;              exportgrid.borderwidth = new unit("1");              exportgrid.cellpadding = 1;                  page.response.clear();              page.response.buffer = true;              page.response.contenttype = "application/vnd.ms-excel";              page.response.charset = "";              page.response.addheader("content-disposition", "attachment; filename=" +                                 filename + ".xls");              writer = new stringwriter();              writer2 = new htmltextwriter(writer);              exportgrid.rendercontrol(writer2);              response.write(writer.tostring());              response.end();

check here see if helpful.

http://stackoverflow.com/questions/2336883/post-back-does-not-work-after-writing-files-to-response-in-asp-net

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