C#

private void listBox1_DragDrop(object sender, DragEventArgs e)
{
    FileInfo fi;
    string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
    int subX = 0;

    for (int ctr = 0; ctr <= files.Length; ctr++)
    {
        if (!listBox1.Items.Contains(files[ctr]))
        {
            fi = new FileInfo(files[ctr]);
            if (fi.Attributes.ToString().Contains("Directory"))
            {
                for (string[] subArFiles = Directory.GetFiles(files[ctr]); subX <= subArFiles.Length; subX++)
                {
                    if(!listBox1.Items.Contains(subArFiles[subX]))
                    listBox1.Items.Add(subArFiles[subX]);
                }
            }
            else
                listBox1.Items.AddRange(files);
        }
        arFiles = (string[])listBox1.Items[ctr];
     }
     MessageBox.Show("hey!"); <big><font color=#ff0000>//why cant i reach this line and the following lines??</font></big>
    listBox1.Items.Clear();
    listBox1.Items.AddRange(arFiles);
    lbl_msg.Text = listBox1.Items.Count.ToString() + " files were selected.";
}