private void exercício3ToolStripMenuItem_Click(object sender, EventArgs e)
{
frmExercício3 frm3 = new frmExercício3();
frm3.MdiParent = this;
frm3.WindowState = FormWindowState.Maximized;
frm3.Show();
}
private void exercício3ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form fc = Application.OpenForms["frmExercício3"];
if (fc != null)
{
fc.Close();
}
frmExercício3 objFrm3 = new frmExercício3();
objFrm3.MdiParent = this;
objFrm3.WindowState = FormWindowState.Maximized;
objFrm3.Show();
}