How to create autocompletion feature?

I would like to create the autocompletion(intellisense) feature in an editor I'm working on. Basically the keywords preceeding the . (period) to invoke the autocompletion box will be u开发者_开发知识库ser defined. i've created the editor using visual c#. Now i need to create an autocompletion box.

can any one help me to do this ?

Thanks in advance

I hope the following site may help you along with sample code :

http://www.codeproject.com/KB/combobox/JGIntelli.aspx