Kotlin Firebase Realtime DB EventListener Question

Question

I have a question while using the Firebase real time DB in Kotlin. Currently, we are getting the seebar value from DB. This code sends the value to the text view normally.

    SeekBardata.addValueEventListener(object :ValueEventListener{
        override fun onDataChange(snapshot: DataSnapshot) {
            seekbarval=snapshot.getValue().toString().toInt()
            binding.textView2.text = seekbarval.toString()
        }

        override fun onCancelled(error: DatabaseError) {
        }
    })

However, the code below cannot send the seebar value to the text view.

    SeekBardata.addValueEventListener(object :ValueEventListener{
        override fun onDataChange(snapshot: DataSnapshot) {
            seekbarval=snapshot.getValue().toString().toInt()

        }

        override fun onCancelled(error: DatabaseError) {
        }
    })

    with(binding) {
        textView2.text = seekbarval.toString()
    }

I don't know the cause. I'd really appreciate it if you could tell me the solution.