[WPF] DragDrop problems

private void ListBorder_MouseMove(object sender, MouseEventArgs e)
{
    if (e.LeftButton != MouseButtonState.Pressed) return;
    if (sender is not Border border) return;

    DragDrop.DoDragDrop(border, new DataObject(typeof(IPlayer), border.DataContext), DragDropEffects.Move);
}

private void ListBorder_MouseMove(object sender, MouseEventArgs e)
{
    if (e.LeftButton != MouseButtonState.Pressed) return;
    if (sender is not Border border) return;

    DragDrop.DoDragDrop(border, new DataObject(typeof(IPlayer), border.DataContext), DragDropEffects.Move);
}