Receive data of Unkown Size

I am using socket class for udp connection. I have to receive data from server but i do not know the size of data. In receive method we have to send byte array. Is there any way i can know how much bytes are available to read so that i can make an array of bytes for that size?

You can do it in a more simple way. Use the UdpClient class and you are done in a few minutes. Have a look at the MSDN help for an example.