C#treeview创建子节点的问题

有两个form，form1和form2，在form2中有textBOX1还有个按钮，按钮响应button_click事件
form2中的代码： private void button1_Click(object sender, EventArgs e)
{

string s = textBox1.Text;
Form1 form1 = new Form1();
form1.ShowString(s);
this.Close();
}
form1中的代码：public void ShowString(string s)
{
this.treeView1.Nodes.Add(new TreeNode(s));
}
为什么这个加的时候treeview里面却没有显示出来子节点的名字为s啊

string s = textBox1.Text; 
Form1 form1 = new Form1();
form1.ShowString(s);
form1.Show();
this.Close();

//contextmenustrip1与treeview1关联，在节点上单击右键就给该节点添加子节点，在空白地方单击右键，就添加根节点 usingsystem; usingsystem.collections.generic; usingsystem.componentmodel; usingsystem.data; usingsystem.drawing; usingsystem.text; usingsystem.windows.forms; namespacewindowsapplication8 { publicpartialclassform1:form { publicform1() { initializecomponent(); this.treeview1.labeledit=true; } privatevoidtreeview1_nodemouseclick(objectsender,treenodemouseclickeventargse) { if(e.button==mousebuttons.right) { this.treeview1.selectednode=e.node; flag=true; contextmenustrip1.show(mouseposition); } } boolflag=false; privatevoid添加节点toolstripmenuitem_click(objectsender,eventargse) { treenodetn=newtreenode(); if(flag) { this.treeview1.selectednode.nodes.add(tn); this.treeview1.selectednode=tn; tn.beginedit(); flag=false; } else { this.treeview1.nodes.add(tn); this.treeview1.selectednode=tn; tn.beginedit(); flag=false; } } privatevoidtreeview1_afterlabeledit(objectsender,nodelabelediteventargse) { e.node.text=e.label; } privatevoidcontextmenustrip1_opening(objectsender,canceleventargse) { if(!flag) { this.treeview1.selectednode=null; } } boolflag1=false; privatevoidcontextmenustrip1_itemclicked(objectsender,toolstripitemclickedeventargse) { flag1=true; } privatevoidcontextmenustrip1_closed(objectsender,toolstripdropdownclosedeventargse) { if(!flag1) { flag=false; } else { flag1=false; } } } }

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