C# File.Delete, File Being Used by Another Process

Delete a file being used by another process

In order to release an image file after loading, you have to create your images by setting the BitmapCacheOption.OnLoad flag. One way to do this would be this:

string filename = ...
BitmapImage image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(filename);
image.EndInit();

Although setting BitmapCacheOption.OnLoad works on a BitmapImage that is loaded from a local file Uri, this is afaik nowhere documented. Therefore a probably better or safer way is to load the image from a FileStream, by setting the StreamSource property instead of UriSource:

string filename = ...
BitmapImage image = new BitmapImage();

using (var stream = File.OpenRead(filename))
{
    image.BeginInit();
    image.CacheOption = BitmapCacheOption.OnLoad;
    image.StreamSource = stream;
    image.EndInit();
}

How to delete file and that file is used by another process using C#

Replacing the image sounds like a good idea - but don't forget to dispose of the old Image that's still holding the file open (and will, by default, until that Image is garbage collected - at some unknown time in the future):

private void btnDelete_Click(object sender, EventArgs e)
 {
        try
        {
            var old = myPictureBox.Image;
            myPictureBox.Image = Image.FromFile(System.IO.Directory.GetCurrentDirectory() + @"\Images\defaultImage.jpg");
            old.Dispose();

            System.IO.File.Delete(txtFileName.Text);
            MessageBox.Show("File Delete Sucessfully");
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
 }

(It may also be possible to Dispose of the Image directly without replacing the image for the PictureBox - it depends on what else you're going to do after deletion - e.g. if the form on which the PictureBox appears is closing that you may want to let that happen first and then just directly dispose of the image).

C# File.Delete, file being used by another process

your process is the one that uses file , you need to set image to null
use something like this :

using(var img = Image.FromFile(foto.SPath).GetThumbnailImage(GetWitdth(photo.SPath, GetHeight(photo.SPath, 150)), GetfHeight(photo.SPath, 150), null, new IntPtr()))
  pctrbFoto.Image = img;

Deleting files gives an error (The process cannot access the file..)

mail.dispose(); You should dispose mail before deleting the file. This should remove the lock on the file.

foreach (var filename in filenames)
{
    var file = Path.Combine(filePath, filename);
    mail.Attachments.Add(new Attachment(file));
}

// Send Mail
smtpServer.Send(mail);
mail.Dispose();
DeleteFiles();

https://msdn.microsoft.com/en-us/library/0w54a951(v=vs.110).aspx

File.Delete cannot delete a file because it is being used by another process. Not sure how to fix this

I would say it is likely that GnuPG is still using the file when you try to delete it.

You need to wait for the process to end before doing the deletion, i.e. add:

proc.WaitForExit(); 

directly before

System.IO.File.Delete(fileName); 

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