multithread client server

this question you asked has 3 levels in total :

1- get data from mysql
almost it is easy to get some data from a database , and this is not tht hard you can't do it;

2- send the stream
the data you got from the databse file must be converted to a stream and you can have a class for socket programming and make a connection betweeen client and server and send the data throw IP;
.net can support it > using System.net

3-store the gotten stream
it is easy too, you can store the data in a server


good luck