1-
www.csharp.org

2-
http://www.csharphelp.com

3-
http://www.mastercsharp.com

4-
http://www.c-sharpcorner.com

5-
http://www.csharp-station.com

6-
http://www.codersource.net/codersource_dot_net.html

7-
http://www.functionx.com