private void 关于ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     About_frm abFrm = new About_frm();
     abFrm.ShowDialog();
 }
        private void 关于ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            About_frm abFrm = new About_frm();

            abFrm.ShowDialog();
        }