How to get live quotes in C#

i'm struggling to obtain live quotes in C# using open Api library

To receive live bid/ask quotes for a symbol, perform the following actions.

• Initialise an object representing the ProtoOASubscribeSpotsReq message.
• Fill the object properties with the ctidTraderAccountId, the symbolId, and, optionally, the subscribeToSpotTimestamp bool.
• Send the newly created message and receive a response of the ProtoOASubscribeSpotsRes type. At this point, you are subscribed to live quotes data and you should receive messages of the ProtoOASpotEvent type.

i'm following this tip but don't able to receive the message of the ProtoOASportEvent type, how can  i manage this problem? How can i send the message of  ProtoOASubscribeSpotsReq type? What type of method or function should i use?