Question regarding tree control

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Hi,

I have a problem regarding the tree control in windows forms.Can anyone
help me on this.The problem definition is as follows.

I have a tree control which always has some default node in it.The user
cannot edit it.How can i do it?I have a button to create new nodes in a
tree.If i select new button then a category should be created and one
node under that category shud get created.If i select the same category
and click new button 1 more node shud get created under that same
category.Only a 2 level heirarchy shud be supported for each category
that is created.

Can anybody help me?
Thanks
Arun

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