Get Maximum Allocated Size For SharePoint Site And Recycle Bin In C#

Question

I am pretty new to Sharepoint, but I am wondering if there is a way to get the maximum allocated space for a Sharepoint Site Collection, Site, and Recycle Bin?

I know to get the size of a Site Collection you could use nameOfSPSite.Usage.Storage to get the size of site collection, but I am looking for a way to get the maximum storage capacity, so I can show users how close their Site Collection, Site, or Recycle Bin are to their limits. I need to also do this programaticly in C#.

Thanks