private void 关于AToolStripMenuItem_Click(object sender, EventArgs e)
{
P170AboutForm aboutFrm = new P170AboutForm();
aboutFrm.lblMainText = "大雄计算器";
aboutFrm.ShowDialog();
}
private void tsmAbout_Click(object sender, EventArgs e)
{
P170AboutForm aboutForm = new P170AboutForm();
string temp = tssMsg.Text;
tssMsg.Text = aboutForm.Text; // 在模态窗体生成之前在状态栏显示
aboutForm.ShowDialog(); // 打开窗体, 该窗体是一个模态窗体
tssMsg.Text = temp; // 恢复
}