How to clear file upload text in server side (c#)

Question

I want to clear the file path from the file upload. The file upload is inside the update panel and I am using a AsyncFileUpload. How can I clear the file and change the background color of the fileupload

btnAudUpload_Click Method

string filename =FileUpload.FileName;
string Fullpath = Path.Combine(@"D:\Media", filename);
if (FileUpload.HasFile)
  { 
 if (filename.ToLower().EndsWith("mp4"))
     {  
      //Saving the file
     }
  else
     {
          //I want to clear the  FileUpload content here
     }    
  }

score 13 · Answer 1 · answered Jan 16 '13 at 18:22

13

Clear the Attributes worked for me... but that will remove styles and other stuff

string filename =FileUpload.FileName;
string Fullpath = Path.Combine(@"D:\Media", filename);
if (FileUpload.HasFile)
{ 
  if (filename.ToLower().EndsWith("mp4"))
  {  
     //Saving the file
  }
  else
  {
     //I want to clear the  FileUpload content here
     FileUpload.Attributes.Clear();
  }    
}

answered Jan 16 '13 at 18:22

Gaddiel Sadoc Peralta

331
3
11

1

I think this is a much more cleaner way of doing it :)! – Muhammedh Nov 11 '13 at 13:53

score 7 · Answer 2 · answered Sep 20 '12 at 03:06

7

I know this thread is almost a year old, but this still seems to be a prevalent issue. The easiest fix I've found is to set the file upload control to a new instance of it.

FileUpload1 = new FileUpload();

answered Sep 20 '12 at 03:06

Justin Ross

372
5
15

1

This definitely gets the job done, although I have to wonder... Do you need to run a Dispose() on the previous control in order to free up its resources? – MadHenchbot May 30 '13 at 21:26
Just a guess, but I would say no. Garbage collection should take care of the cleanup. – Justin Ross Jun 01 '13 at 01:03

score 3 · Answer 3 · answered Dec 22 '11 at 00:04

If you want to have interactivity without relouding the page you'll have to use JavaScript. That's why I would check the file extension on the client side instead of the server side. Example:

function checkFile() {
    var input = document.getElementById('fileUpload').value.toLowerCase();
    var extension = '.mp4';

    if (!input.indexOf(extension, input.length - extension.length) != -1) {
        alert('Invalid file extension. Only .mp4 is allowed.');
        document.getElementById('fileUpload').value = '';
    }
}

The only thing you'll have to add is changing the fileUpload background color which is very easy to do.

Good luck!

question: how to change the background color, where is the solution, you posted code which not required, stop placing use less answers — Sun, Mar 10 '14 at 10:59

score 1 · Answer 4 · answered Feb 27 '13 at 11:41

1

I think when you do postback the file contnet property will removed by default, because a security reasons !

answered Feb 27 '13 at 11:41

Prince Waleed

195
8

How to clear file upload text in server side (c#)

4 Answers4

Linked