I would like to request your help. I want to develop an own application but I only have experience in C. This is because afer doing a research I came across a site (http://www.voip-sip-sdk.com/) which deals with development and sample programs. I had a closer look and found that the samples are based on an SDK called Ozeki VoIP SIP SDK. I have also noticed that C# knowledge is needed. Could you please help me how to start C# the most effective way? With tutorials, books, Visual Studio? If there is anything you could suggest I would be most appreciated. Thanks.