How do I connect C# with Postgres?

How do I connect C# with Postgres? I installed the npgsql data provider but couldn't make it work. Are there more examples than the ones in the Postgres site?

Where do I connect C wire?

On the C-Wire Adapter's "Equipment" side, connect the wires to the corresponding terminals on the control board. Note: Be sure to remove the plastic tip on each wire before connecting to a terminal. Use the included mount and adhesive pad to attach the C-Wire Adapter inside your furnace or heating system.

What color wire goes in C?

Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

You want the NPGSQL library. Your only other alternative is ODBC.