Text version of the video
http://csharp-video-tutorials.blogspot.com/2012/06/part-30-c-tutorial-interfaces-in-c.html
Slides
http://csharp-video-tutorials.blogspot.com/2013/08/part-30-introduction-to-interfaces.html
All C# Text Articles
http://csharp-video-tutorials.blogspot.co.uk/p/free-c-video-tutorial-for-beginners.html
All C# Slides
http://csharp-video-tutorials.blogspot.com/p/c.html
Complete C# tutorial
https://www.youtube.com/playlist?list=PLAC325451207E3105
All Dot Net and SQL Server Tutorials in English
https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd
All Dot Net and SQL Server Tutorials in Arabic
https://www.youtube.com/c/KudvenkatArabic/playlists
