c#
db & mysql:
http://www.codeproject.com/KB/cs/CsharpAndMysql.aspx
http://www.tutorialized.com/view/tutorial/Using-C-with-MySQL/33676
http://entwickler-forum.de/showthread.php?t=39652
http://www.aspfree.com/c/a/Database/Database-Programming-in-C-Sharp-with...
http://www.connectionstrings.com/
performance:
http://www.vcskicks.com/optimize_csharp_code.html
http://en.csharp-online.net/CSharp_String_Theory%E2%80%94String_Performa...
http://www.codeproject.com/KB/dotnet/NET_Tips_and_tricks.aspx
http://www.codeproject.com/KB/cs/effective1.aspx
http://www.codeproject.com/KB/cs/FindMulShift.aspx
http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=8a2e454...
http://msdn.microsoft.com/en-us/library/ms998530.aspx
http://channel9.msdn.com/forums/TechOff/246514-Performance-Optimization-...
http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/f58d6...
http://msdn.microsoft.com/en-us/library/ms973839.aspxhttp://www.develope...
datagridview:
http://www.debugging.com/bug/15227
http://dotnetperls.com/datagridview-tips
http://dotnetperls.com/datagridview-tutorial
http://www.csharp-station.com/Tutorials/ADODotNet/Lesson05.aspx
http://www.switchonthecode.com/tutorials/csharp-tutorial-binding-a-datag...
http://bytes.com/topic/c-sharp/answers/568470-datagridview-performance
http://bytes.com/topic/c-sharp/answers/446521-datagridview-performance-i...
http://www.csharp-station.com/Tutorials/ADODotNet/Lesson05.aspx
double buffered datagridview wrapper:
http://stackoverflow.com/questions/842354/datagrid-slow-to-redraw
http://stackoverflow.com/questions/118528/horrible-redraw-performance-of...