具体说说吧，这个菜单是在用户的个人中心用的。
比如说，网站的服务有五个频道，每个频道下又有不同的栏目，每个栏目都有几个操作，如发表的帖子、回复的帖子、收藏的帖子。这是个导航链接，当点击树形菜单中的“发表的帖子”就会链接到相应页面。
也就是像CSDN这样的导航菜单，有个加号，点击加号后加号变成减号并自动展开子菜单内容，，点击减号后，减号变成加号并自动折叠子菜单。
请教大侠们，给个思路吧，C#如何实现？谢谢！能给个简单完整的例子，就更感谢了。
比如说，网站的服务有五个频道，每个频道下又有不同的栏目，每个栏目都有几个操作，如发表的帖子、回复的帖子、收藏的帖子。这是个导航链接，当点击树形菜单中的“发表的帖子”就会链接到相应页面。
也就是像CSDN这样的导航菜单，有个加号，点击加号后加号变成减号并自动展开子菜单内容，，点击减号后，减号变成加号并自动折叠子菜单。
请教大侠们，给个思路吧，C#如何实现？谢谢！能给个简单完整的例子，就更感谢了。
private System.Windows.Forms.TreeView tvManage;
this.tvManage = new System.Windows.Forms.TreeView(); System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(FormMain));
System.Windows.Forms.TreeNode treeNode1 = new System.Windows.Forms.TreeNode("管理员管理");
System.Windows.Forms.TreeNode treeNode2 = new System.Windows.Forms.TreeNode("安全管理");
System.Windows.Forms.TreeNode treeNode3 = new System.Windows.Forms.TreeNode("资金出入");
System.Windows.Forms.TreeNode treeNode4 = new System.Windows.Forms.TreeNode("账户管理", new System.Windows.Forms.TreeNode[] {
treeNode2,
treeNode3});
System.Windows.Forms.TreeNode treeNode5 = new System.Windows.Forms.TreeNode("交易时间管理");
System.Windows.Forms.TreeNode treeNode6 = new System.Windows.Forms.TreeNode("节假日管理");
System.Windows.Forms.TreeNode treeNode7 = new System.Windows.Forms.TreeNode("交易单管理");
System.Windows.Forms.TreeNode treeNode8 = new System.Windows.Forms.TreeNode("交易商品管理");
System.Windows.Forms.TreeNode treeNode9 = new System.Windows.Forms.TreeNode("节点8");
System.Windows.Forms.TreeNode treeNode10 = new System.Windows.Forms.TreeNode("节点9");
System.Windows.Forms.TreeNode treeNode11 = new System.Windows.Forms.TreeNode("节点10");
System.Windows.Forms.TreeNode treeNode12 = new System.Windows.Forms.TreeNode("节点11");
System.Windows.Forms.TreeNode treeNode13 = new System.Windows.Forms.TreeNode("节点12");
System.Windows.Forms.TreeNode treeNode14 = new System.Windows.Forms.TreeNode("节点13");
System.Windows.Forms.TreeNode treeNode15 = new System.Windows.Forms.TreeNode("节点14");
System.Windows.Forms.TreeNode treeNode16 = new System.Windows.Forms.TreeNode("节点15");
System.Windows.Forms.TreeNode treeNode17 = new System.Windows.Forms.TreeNode("节点16");
System.Windows.Forms.TreeNode treeNode18 = new System.Windows.Forms.TreeNode("节点17");
System.Windows.Forms.TreeNode treeNode19 = new System.Windows.Forms.TreeNode("节点18");
System.Windows.Forms.TreeNode treeNode20 = new System.Windows.Forms.TreeNode("节点19");
System.Windows.Forms.TreeNode treeNode21 = new System.Windows.Forms.TreeNode("节点20");
System.Windows.Forms.TreeNode treeNode22 = new System.Windows.Forms.TreeNode("Sunde server", new System.Windows.Forms.TreeNode[] {
treeNode1,
treeNode4,
treeNode5,
treeNode6,
treeNode7,
treeNode8,
treeNode9,
treeNode10,
treeNode11,
treeNode12,
treeNode13,
treeNode14,
treeNode15,
treeNode16,
treeNode17,
treeNode18,
treeNode19,
treeNode20,
treeNode21});
//
// tvManage
//
this.tvManage.Dock = System.Windows.Forms.DockStyle.Fill;
this.tvManage.Location = new System.Drawing.Point(0, 0);
this.tvManage.Name = "tvManage";
treeNode1.Checked = true;
treeNode1.Name = "tnSystemAdmin";
treeNode1.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
treeNode1.Text = "管理员管理";
treeNode2.Name = "tdAccountCapital";
treeNode2.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
treeNode2.Text = "安全管理";
treeNode3.Name = "tdCapitalRecord";
treeNode3.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
treeNode3.Text = "资金出入";
treeNode4.Checked = true;
treeNode4.Name = "tdAccount";
treeNode4.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F);
treeNode4.Text = "账户管理";
treeNode5.Checked = true;
treeNode5.Name = "tnTradeTime";
treeNode5.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F);
treeNode5.Text = "交易时间管理";
treeNode6.Checked = true;
treeNode6.Name = "tnHoliday";
treeNode6.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F);
treeNode6.Text = "节假日管理";
treeNode7.Checked = true;
treeNode7.Name = "tnTradeOrder";
treeNode7.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F);
treeNode7.Text = "交易单管理";
treeNode8.Checked = true;
treeNode8.Name = "tnTradeSymbol";
treeNode8.NodeFont = new System.Drawing.Font("微软雅黑", 8.25F);
treeNode8.Text = "交易商品管理";
treeNode9.Name = "节点8";
treeNode9.Text = "节点8";
treeNode10.Name = "节点9";
treeNode10.Text = "节点9";
treeNode11.Name = "节点10";
treeNode11.Text = "节点10";
treeNode12.Name = "节点11";
treeNode12.Text = "节点11";
treeNode13.Name = "节点12";
treeNode13.Text = "节点12";
treeNode14.Name = "节点13";
treeNode14.Text = "节点13";
treeNode15.Name = "节点14";
treeNode15.Text = "节点14";
treeNode16.Name = "节点15";
treeNode16.Text = "节点15";
treeNode17.Name = "节点16";
treeNode17.Text = "节点16";
treeNode18.Name = "节点17";
treeNode18.Text = "节点17";
treeNode19.Name = "节点18";
treeNode19.Text = "节点18";
treeNode20.Name = "节点19";
treeNode20.Text = "节点19";
treeNode21.Name = "节点20";
treeNode21.Text = "节点20";
treeNode22.Checked = true;
treeNode22.Name = "";
treeNode22.NodeFont = new System.Drawing.Font("新宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
treeNode22.Text = "Sunde server";
this.tvManage.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
treeNode22});
this.tvManage.Size = new System.Drawing.Size(194, 320);
this.tvManage.TabIndex = 0;
this.tvManage.NodeMouseClick += new System.Windows.Forms.TreeNodeMouseClickEventHandler(this.treeView1_NodeMouseClick);
this.Controls.add(tvManage);