add child node of treeview at runtime

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C#3.0

C#

my requirement is to add a node in the Treeview control under parent control i.e parent name is given by combobox and child name is given by textbox.

on load of page treeview is shown with three parent node. Now user select the parent node from combobox and wirte child node name through textbox. when i click ok chid node come under that parent node.

Also, there should be an option like whether user wants to enter a new node or enter a child node under existing node.

There are only 2 levels.

Ex.

Administrator

1.1

1.2

user

2.1

2.2

So now I should have the option in a combobox that whether I want to add a new node (for ex. 3) or I want to add a child node under 1 or 2.

If I add a new node, then it should automatically come into the Dropdown control.