private void btnLivreManagement_Click(object sender, EventArgs e)
{
var frmCreateLivre = new CreateLivre(_frmMdi) {MdiParent = _frmMdi};
frmCreateLivre.Show();
}
private void addBookToolStripMenuItem_Click(object sender, EventArgs e)
{
var frmCreateLivre = new CreateLivre(this);
frmCreateLivre.MdiParent = this;
frmCreateLivre.Show();
}