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];
}
}
}