asp.net文件下载

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protected void Button1_Click(object sender, EventArgs e)
{
if (!Directory.Exists(Server.MapPath("upfile/")))
{
Directory.CreateDirectory(Server.MapPath("upfile/"));
}
FileUpload1.SaveAs(Server.MapPath("upfile/") + FileUpload1.FileName);
if (System.IO.File.Exists(Server.MapPath("upfile/") + FileUpload1.FileName))
{
Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); //解决中文乱码
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(FileUpload1.FileName)); //解决中文文件名乱码
Response.ContentType = "appliction/octet-stream";
Response.WriteFile(Server.MapPath("upfile/") + FileUpload1.FileName);
Response.End();
}

//try
//{
// FileUpload1.SaveAs(Server.MapPath("upfile/") + FileUpload1.FileName);
//}
//catch
//{
// Response.Write("<script>alert('该文件已经存在！')</script>");
//}
//string filename = FileUpload1.FileName;

//if (FileUpload1.FileName.Substring(filename.LastIndexOf('.')).Equals(".doc") || FileUpload1.FileName.Substring(filename.LastIndexOf('.')).Equals(".docx"))
//{
// ConvertFileWordToHtml(Server.MapPath("upfile/") + FileUpload1.FileName);
//}
//else
//{
// ExcelConvertToHtml(Server.MapPath("upfile/") + FileUpload1.FileName, Server.MapPath("upfile/") + FileUpload1.FileName + ".html");
//}
}