ASP. NET upload file Request.Files file not available

Using FTP to upload files, and request.files get files, today found that the number of files obtained is always 0, check the original form tag to add enctype= "Multipart/form-data", hehe

<form enctype= "Multipart/form-data" id= "Form1" runat= "Server" > <input type= "file" name= "filename"/>//nam E Properties </form>
Query finally know that in addition to these external upload control must have the Name property, depressed

ASP. NET upload file Request.Files file not available