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I have built two programs in C# and I am sending simple strings through the sockets. This is fine for the moment but in the near future I will need to send more complicated items, such as objects down the sockets and eventually files.
What steps would I take to do this? What purpose do the buffers serve for the sockets/streams? Apologies if I am a little vague.
If you are sending objects, you have to really be careful with what you do and how you are planning on using those objects on the other end. All properties need to be serialized. If you are going to have large amounts of data in theses objects, you may want to use binary serialization instead.
Also, look at the guidelines posted here: MSDN Serialization Guidelines
If you are going to be sending objects, you may want to look at either .Net Remoting options or WCF Services if applicable. Rolling your own socket handlers and then using it for complex operations is asking for a lot of time and pain, especially if you haven’t done it before.