Windows

Sample Class

Files
File I/O and Serialization (ALL TYPES!)

Data

DataBinding Sample (Bound Textbox)
DataGridView (1)
DataGridView (2)
DataGridView, BindingNavigator

Upload/Download a file

ASP.net

SampleClass
How to send email
GridView Basics
Dropdownlist
ListBox
Table
__doPostBack
Cookies
Multiview and View Controls
WebUserControl and Raising Events
Ajax Simple Sample

SqlDataSource