C# ListView DragDrop Event Method Executing Twice Per Drop

The method executes twice in a row and there's no apparent reason for doing so.It happens in VS2010 Express (4.0) and in VS2008 (3.5).

public GUI(){    InitializeComponent();    this.lvwFiles.DragDrop += new System.Windows.Forms.DragEventHandler(this.lvwFiles_DragDrop);    this.lvwFiles.DragEnter += new System.Windows.Forms.DragEventHandler(this.lvwFiles_DragEnter);}  private void lvwFilesAdd(string path, string[] paths){ ... }  private void lvwFilesWrite(){ ... }  private void lvwFiles_DragEnter(object sender, DragEventArgs e){    if (e.Data.GetDataPresent(DataFormats.FileDrop))        e.Effect = DragDropEffects.Copy;    else        e.Effect = DragDropEffects.None;}  private void lvwFiles_DragDrop(object sender, DragEventArgs e){    if (e.Data.GetDataPresent(DataFormats.FileDrop))    {        var paths = (string[])e.Data.GetData(DataFormats.FileDrop);        var path = Path.GetDirectoryName(paths[0]);        lvwFilesAdd(path, paths);        lvwFilesWrite();    }}