C# Drag and Drop Image from Treeview -

i'm building application users create game terrain using hex tiles. have tree view various tile types , have managed load images want use (png's) tree node images.

i have used code here http://www.codeproject.com/articles/14948/hexagonal-grid-for-games-and-other-projects-part basis project, although have expanded allow corner, , both "types" of half hexes.

what want accomplish drag tile type tile catalogue tree view onto hex grid drawn, , image snap grid , align correctly. imagine actual image drawn on grid end being loaded separately treeview images small versions of original images.

now know there's whole heap of items in there don't know how yet first in list drag , drop. searching i've done has turned drag , drop examples dragging within treeview, or 1 control , i'm not sure examples relevant.

can point me in right direction begin playing myself or give example base need on?