In a enterprise network, what would be the right way to generate a list of switches (SNMP managed)

Is it reasonable to ask the organization to supply a list such as this:

• Switch name
• IP Address of switch
• Location
• SNMP community strings

Or are there standard ways to run discovery scans - UDP broadcasts?

After having generated a repository such as the above; given a single switch, how to query it for the list of all devices attached to it?

Finally, how to selectively power down/power up ports? (remotely - using SNMP)

Platform is going to be .NET based (C#) and the library being used is SharpSNMP