Response.Write("<script>window.οnlοad=function (){if(confirm(\"该文件已经存在，确定要替换吗吗?\")){document.getElementById(\"hidIsSave\").value = \"1\" }else {document.getElementById(\"hidIsSave\").value = \"0\"}}</script>");

if (hidIsSave.Value == "1")

{

File.Delete(Server.MapPath(FileName));

fuload.SaveAs(Server.MapPath(FileName));

}

else

{

}