Does anyone know what can i do now?
I can still press the button, but it just seems that the remote is stopped sending signal to the car.

And now I cant unlock the car. And if I open the car with the key, the alarm will go off. What should I do???

 

Take it apart and dry it off with a paper towel. If that doesn't work put in an oven at a very low heat (opened up) , around 125F for a hour to dry it out.

 

I think it has dried out during the night..
I also tried to take it apart, and use hair dryer to dry it.. it doesnt help..

 

Your probably going to have to go to your nearest audio shop and buy a new remote.