private void MassRenameClicked()
{
var massRenameForm = new frmMassRename(lvMain, lblFilenameValue, false);
massRenameForm.ShowDialog();
}
private void RenameSelectionClicked()
{
var massRenameForm = new frmMassRename(lvMain, lblFilenameValue, true);
massRenameForm.ShowDialog();
}