private void button1_Click(object sender, EventArgs e)
{
CarRegForm cr = new CarRegForm();
cr.Show();
this.Hide();
}
private void carRegistrationToolStripMenuItem_Click(object sender, EventArgs e)
{
CarRegForm cr = new CarRegForm();
cr.Dock = DockStyle.Fill;
this.panel1.Controls.Clear();
this.panel1.Controls.Add(cr);
cr.Show();
}