Parsing LLDP packet and get chassisid MAC address

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C#

Hi,
Successfully wrote some code to read and parse an LLDP packet (SharpPcap). Want to now get the TLVs and print them out to screen.

output of code:

Console.WriteLine(Tlv);
Console.WriteLine("type:" + Tlv.GetType().ToString());

[ChassisId: SubType=MacAddress, SubTypeValue=F0921C8332C0]
type:PacketDotNet.Lldp.ChassisIdTlv

How can I read/access the value of SubTypeValue?

String ChassisIDMacAddress = LLDP.TlvCollecttion[0]????????

What I have tried:

tried different things without success.