I use the Solnet nuget package on my .net application and I cannot assign a custom fee value for any token transfer or sol transfer in this package. After this process, it automatically gives the fee value as 0.000005 SOL. And the token transfers I sent cannot be found on the network, and I think the reason for this is the low fee amount. I have never encountered a manual fee assignment method in the Solnet nuget package.

var transactionBuilder = new TransactionBuilder()
 .SetRecentBlockHash(recentBlockHash.Result.Value.Blockhash)
 .SetFeePayer(fromAccount)
 .AddInstruction(TokenProgram.Burn(
 fromAssociatedTokenAccount,
 receiverAssociatedTokenAccount,
 100000,
 fromAccount
 ));