[flexcoders] pass String with socket

[markflex2007]

Hi,

I pass string with socket in Flex

I can see the data with
trace(socket.readUTF());

but I can not do (otherwise I get #2030 error)
var s:String= socket.readUTF();

I try to do 
var s:String=socket.readUTFBytes(socket.bytesAvailable);

but socket.bytesAvailable = 0 why? I can see a string with 
trace(socket.readUTF());

how to save the socket data to a string variable?

Thanks

Mark