Hi,
The HANA Clients is available in SMP and, as usual, no-brainer to install. Official documentation here: SAP HANA Client Installation and Update Guide - SAP Library
Also, there's the official documentation on how to establish odbc connection to HANA and didn't took much to find a C# example using ODBC and connecting to HANA.
Please search before asking.
Thanks and Regards,
Lucas de Oliveira