If (fileupload. PostedFile! = Null)
{
// Addto is the attribute to be added, and aboutfile is the file description.
String nam = fileupload. PostedFile. FileName;
// Obtain the index of the last "." In the file name (including the path)
Int I = nam. LastIndexOf (".");
// Get the file extension
String newext = nam. Substring (I );
// Here, I automatically name the File Based on the date and file size to ensure that the file name is not repeated
DateTime now = DateTime. Now;
String newname = now. DayOfYear. ToString () + fileupload. PostedFile. ContentLength. ToString ();
// Save the file to the directory you want. This is the upload directory under the IIS root directory. You can change it.
// Note: Server is used here. ath () obtains the relative directory of the current file. in asp.net, "" must be replaced by "". Changing "upload" to "upload" becomes the absolute directory of the current file.
Fileupload. PostedFile. SaveAs (Server. MapPath ("upload" + newname + newext ));
// Obtain the relevant attributes of the file: file name, file type, and file size.
// Fname. Text = myFile. PostedFile. FileName;