Thanks. I have no idea what i am doing. can you explain what do you mean by serialization?
Look here for the method SendEvent to have some example of the right serialization to make
https://github.com/smaciullator/NostrSharp/blob/main/NostrSharp%2FRelay%2FNSMultiRelay.cs
Discussion
Serialization is the process of transforming the data into a formatted string, in the way relay are expecting