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Display error if a treeview root node contains a child node

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :Windows Application
I am having a treeview initially with a root node when form is loaded. I will add child node as some.txt file at the runtime by selecting an option as Addnew from contextmenu which was displayed when the user right clicks on the root node. Now what i need is if the tree has child node appended to the Root and if user tries to create a new node by clicking the option addnew from context menu i would like to display an error as only one child allowed.   Can any one help

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