I'm currently working on a presentation that involves C# (and .NET). Is there some kind of official logo of the programming language? If so, do you know of a free image source? I tried google but to no avail.
I don't know of an official logo for the C# language, however, there is a logo for the general "world" of .NET.
The current .NET logo is:
This was introduced sometime around the end of 2008. Here's the blog post from Microsoft's Scott Hanselman that details this:
However, regarding using the logo yourself, please see this Stack Overflow question (and specifically the accepted answer):
In short, the answer is No. :(