treeview treeNodes

Hello guys,
I very new in C# and i started building an app for my company.

Overall it haves a lot of functions one of them it showing treeview populated from a database. Im populating the tree at every mouseclick on the treeNode. The nodes are references in DB to some physical files on a fileserver. The problem comes at reverse, building the tree based on the files.
At reverse i need to build the tree based on the query result.
It seems that it should be like this: Get the root node expand > get and add child's expand > from the child's select the one i need expand > add child's > from here select the one that i need .... and so on . I dont know how to do this from code without mouse events.

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