Create TXT file from TreeView control in c++

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.NET3.5

C++/CLI

Windows

.NET

, +

I need to transfer data from treeView1 control to some .txt file.
I am using streamwriter for creating file from System::IO..
This is how treeView looks:
http://postimg.org/image/pwnc4s01v/[^]

And here is code , which won't work, i tried to transfer from Private only to txt first then i would copy code for the rest..

//code sample
			 String^ s1;
			 String^ s2;
			 String^ s3;
			 int n;
			 n = treeView1->TopNode->Nodes[0]->Nodes->Count;
			 int m;
			 m = treeView1->TopNode->Nodes[1]->Nodes->Count;
			 int z;
			 z = treeView1->TopNode->Nodes[2]->Nodes->Count;
			 //upisujemo
			 StreamWriter^ sw = gcnew StreamWriter("view.txt");
			 sw->WriteLine("class " + treeView1->TopNode->Text + " {");
			 for(int i  = 0; i<n; i++)
			 {
				 sw->WriteLine(treeView1->TopNode->Nodes[0]->Text);
				 sw->WriteLine(treeView1->Nodes[1]->Nodes[i]->Text);	
			 }
			 
			 sw->Flush();
			 sw->Close();
			 delete sw;