winform treeview绑定数据 DOM操作

        public void treeView()
        {

            //  datatable 定义变量接收 传归来的值
            DataTable Father = new BuMenDA().ConSql();
            //查询出来的的结果不可能为空 for循环一条条查出来
            for (int a = 0; a <= Father.Rows.Count; a++)
            {// 定义新的节点接a行的 Name列 
                TreeNode fatherNode = new TreeNode(Father.Rows[a]["Name"].ToString());

                //给节点添加数据源
                fatherNode.Tag = Father.Rows[a]["Name"].ToString();
                // 绑定节点的Name值  Code  以便以后使用
                fatherNode.Name = Father.Rows[a]["Code"].ToString();

                treeView1.Nodes.Add(fatherNode);
                //添加父节点

                //根据节点的  Name 查询另一个表的数据
                DataTable child = new BuMenDA().ConSql1(int.Parse(fatherNode.Name));
             //再次循环
                for (int b = 0; b < child.Rows.Count; b++)
                {
                    //同上  建立新的节点接收传过来值
                    TreeNode ChildNode = new TreeNode(child.Rows[b]["Name"].ToString());
                    //绑定数据源
                    ChildNode.Tag = child;
                    //在添加父节点的基础上添加子节点
                    fatherNode.Nodes.Add(ChildNode);

                }
             

            }


        }
   
        private void Form1_Load(object sender, EventArgs e)
        {
            treeView();
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Data.Sql;
using System.Data;
namespace ListViewAdd.UseDA
{
  class BuMenDA
    {
      private string conn()
      {
          return "Server=.;Database=BuMen;User ID=sa;Password=123";
      }
      //查询第一个表的数据
      public DataTable ConSql()
      {
          string sql = "select * from BuMenShow";

          SqlConnection MyCon = new SqlConnection(conn());

          MyCon.Open();

          SqlDataAdapter myda = new SqlDataAdapter(sql, conn());

          DataSet MD = new DataSet();

          myda.Fill(MD);

          return MD.Tables[0];
      }
      //查询第二个表的数据

      public DataTable ConSql1(int Code)
      {

          string sql = "select * from Member  where MemCode =" + Code;

          SqlConnection MyCon = new SqlConnection(conn());

          MyCon.Open();

          SqlDataAdapter myda = new SqlDataAdapter(sql, conn());

          DataSet MD = new DataSet();

          myda.Fill(MD);

          return MD.Tables[0];
      }
    }
}