How to create a certificate for Digital Signature

I working on digital signatu开发者_开发问答re and I'm using BouncyCastle library in c# but I don't understand how I'm going to create certificate?

Especially hmm server and client, how are they working together?

If all you need is something like a self-signed certificate to do some testing, there are a few ways:

• Online web tools (http://www.makecert.com/tools/create-self-signed-ssl-certificate/default.aspx)

• Bouncy Castle itself (http://www.bouncycastle.org/wiki/display/JA1/X.509+Public+Key+Certificate+and+Certification+Request+Generation)

• IIS has some tools to do this (http://technet.microsoft.com/en-us/library/cc753127(WS.10).aspx)

• OpenSSL