This appears to be the THIRD time you have asked this question. This first time you received no replies. The second time you received a messsage to say that "your method for asking for help probably isn't the most effective." I should point out that if you have a question regarding an article (http://www.codeproject.com/dotnet/CSharpWhiteboard.asp[^]) you should ask in the forum of the article. You have not done this. Secondly, your question ("how to finish it???") requires and answer that will be very time consuming to answer fully. However, a brief look at the article would suggest that it IS finished as the original author only intended to write a 2 person whiteboard. My: Blog | Photos | Next SQL Presentation WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More

I feel compelled to explain that your method for asking for help probably isn't the most effective. If I were to change the code I would probably change it to use a Message Oriented architecture. - Drew