Client Server in C#

Hi
I have written code for the Udp client server communication..It works well.The problem is that the server sends and receives the message but simply closes when i click a button to send the message so im unable to view the message displayed on the server..I have attached the server code..please tell me what change should i make to keep the server alive.Thanks for any help in advance

i saw your code...i don't understand why you don't have if condition in your loop and never you set done to true?