private void btForceForm_Click(object sender, EventArgs e)
 {
     string str = treeView1.SelectedNode.Text;
     int i = Convert.ToInt32(str.Length == 5 ? str.Substring(1, 1) : str.Substring(1, 2));
     if (i == 1)
     {
         FrmBearForceAnalysis1 childFrame = new FrmBearForceAnalysis1(i);
         childFrame.Show();
     }
     if (i == 2)
     {
         FrmBearForceAnalysis2 childFrame = new FrmBearForceAnalysis2(i);
         childFrame.Show();
     }
     if (i == 3)
     {
         FrmBearForceAnalysis3 childFrame = new FrmBearForceAnalysis3(i);
         childFrame.Show();
     }
     if (i == 4)
     {
         Form11 childFrame = new Form11(i);
         childFrame.Show();
     }
 }