Change of programming language in sample application

Greetings,

I have a task to build an own application with Ineractive Voice Response and Dual Tone Multi Frequency features. It has to be written in C#.

I just happend to find a guide that provides the thing I am looking for: http://www.voip-sip-sdk.com/p_331-vb-net-dtmf-ivr-voip.html

This whole solution is made with the help of an SDK called Ozeki SIP SDK and it is in VB.NET. The thing is that I only worked with BASIC and that was so long ago.

Becasue I have not worked with C# and VB.NET I would like to kindly ask you to help me out.

How is it possible to switch the programming language from Visual Basic .NET to be C#.

Your answers are highly appreciated.