private void atividade3ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (Application.OpenForms.OfType <frmExercicio3>().Count() <= 0)
{
frmExercicio3 frm3 = new frmExercicio3();
frm3.Show();
}
}
private void exercicio3ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form fc = Application.OpenForms["frmExercicio3"];
if (fc != null)
{
fc.Close();
}
frmExercicio3 FrmExercicio3 = new frmExercicio3();
FrmExercicio3.MdiParent = this; // anexar o form 'filho' dentro do form 'pai'
FrmExercicio3.WindowState = FormWindowState.Maximized;
FrmExercicio3.Show();
}