Verify your code with SharePoint Dispose Checker Tool
SharePoint Dispose Checker Tool is a great way to identify potential problems in your Sharepoint code for IDisposable objects.
Object Model
Update List Item without changing Modified By and Modified fields
Here is a quick way of updating item fields without changing Modified and Modified By fields
How to find End Date Pattern in Sharepoint Recurring Event
This article describes the way to find the end date range pattern of Sharepoint recurring event
