private void btnAlta_Click(object sender, EventArgs e)
 {
     this.Hide();
     AltaProvForm alta = new AltaProvForm();
     alta.Owner = this;
     alta.Show();
 }
        private void btnAlta_Click(object sender, EventArgs e)
        {
            this.Hide();
            AltaProvForm alta = new AltaProvForm();

            alta.Owner = this;
            alta.Show();
        }