asp.net fileupload

(1)上传大小限制

 <system.web>
  <httpRuntime maxRequestLength="102400" executionTimeout="720"/>

参数最大 2091151 是2G

(2)获取扩展名

if (filUpload.PostedFile == null || (System.IO.Path.GetExtension(filUpload.PostedFile.FileName).ToLower() != ".bak"))
{
Response.Write(ShowAlert("The upload file must be *.bak"));
return;
}