I need to document a number of tree type structures and wish to use SQL as the data source and ideally a .NET ASP front end. Ideally I want to store all data in one structure and allow users to navigate through the different structures and jump between them at relevant nodes. The tree structures are a network infrrastructure with multiple routes between switches, the power distribution feeding all the switches and the building structure where the various physical items exist. I'm after some ideas on the data structure, I have a few different structures in mind but the all have downfalls or complexity. SteveJ