将android客户端连接为C＃服务器

I developed small client server (client in Android to send data) and server in PC (receive data and print it out), it works only one time (by sending data from android device to pc) the I should close the android app and run it again? by the way I have client app in PC it works properly, I can send from it and the server receives but for the client in android!I developed small client server (client in Andr