private void Form1_Load(object sender, EventArgs e)
        {
            treeView1.ShowLines = true;
            treeView1.ImageList = imageList1;
            SqlConnection con = new SqlConnection("server=.;uid=sa;database=db");
            con.Open();
            SqlCommand com = new SqlCommand("select * from dbzx", con);
            SqlDataReader dr = com.ExecuteReader();
            TreeNode nodel = treeView1.Nodes.Add("A", "資訊", 1, 2);
            while (dr.Read())
            {
                TreeNode nodel2 = new TreeNode("資訊1" + dr[1].ToString(), 3, 4);
                nodel2.Nodes.Add("A", " 資訊2" + dr[0].ToString(), 5, 6);
                nodel.Nodes.Add(nodel2);
            }
            dr.Close();
            con.Close();
            treeView1.ExpandAll();
        }

把資料庫資料改成節點檔案顯示在treeview中