Windows service doubt ??

Question

Hi

check the below link

http://www.codeproject.com/Articles/16335/Simple-Windows-Service-which-sends-auto-Email-aler


In this link i did get whats teh 4th point mean can u please help me to sort it out 

And please help me to make the entire code wrol using vs 2010 :)
PS:I have done max but in foreach loop i am getting obsolute error & problem with indexers as its is read-only popping out it cant be assigned 

Once please check my attachment & try it finally please get me were i am getting wrong 


Thank you soo much