private void 数据显示ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     df = Dynamic_Form.InstanceObject();
     df.Focus();
     df.Show();
 }
 private void toolStripButton4_Click(object sender, EventArgs e)
 {
     df = Dynamic_Form.InstanceObject();
         df.Focus();
         df.Show();
 }