I would like to create a sample Addin in solid edge with C#.
Do you have any example ?
I'm working on training videos this week but you're welcome to start using the new Solid Edge Community Templates on the Visual Studio Gallery if you want to get a head start. This will install C# & Visual Basic addin templates on your machine.
From Visual Studio 2012 or 2013, navigate to Tools -> Extensions and Updates. Once the templates are installed, you can get to them via the New Project dialog.
Keep an eye out on the Solid Edge Developer Blog for posts from me about this and much more. Let me know if you have any questions.