I want to create program for client-server.
Where server run continuously..... when client starts...server send one exe to c drive on client machine..... execute the exe...and return result to server...
For multiple client ...

How to do this ??
Plz give me hint or any sample code???

Don't do it like that because it would cause a huge security risk. Instead, have the client pull the file from the server, run it and send results back to server.

>>Plz give me hint or any sample code???
Client/server sample code ? You can find some at DataReel.com. Free library that contains lots of code, including client/server