How to add items to listbox if not exist?

Question

I'm having an issue with my code, I'm trying to add items from a Directory to a ListBox, the issue is that I keep getting the same items (duplicated) over and over again.

here is my code:

String[] filesDir = Directory.GetFiles(@"C:\FOLDER");
foreach (string file in filesDir)
  if (!this.listbox1.Items.Contains(file))
  {
    listbox1.Items.Add(Path.GetFileNameWithoutExtension(file ) + @"  found");
  }

Answer 1

The string you are checking to see if it exists in the ListBox is different from the string being added.

The modification of the code is as follows:

String[] filesDir = Directory.GetFiles(@"C:\FOLDER");
foreach (string file in filesDir)
{
    var NewLineText = Path.GetFileNameWithoutExtension(file) + @"  found";
    if (!this.listBox1.Items.Contains(NewLineText))
        listBox1.Items.Add(NewLineText);
}