Asynchronous Programming in ASP.NET

http://www.eggheadcafe.com/articles/20060918.asp


http://msdn.microsoft.com/en-us/magazine/cc164128.aspx

Scalable Apps with Asynchronous Programming in ASP.NET

Building scalable ASP.NET website...
http://msdn.microsoft.com/en-us/magazine/cc163463.aspx

Iterators in VB.NET

Another samples from microsoft:

1)
http://support.microsoft.com/kb/322025/en-us/#top

2)
http://msdn.microsoft.com/fr-fr/library/system.collections.ienumerator.aspx

Iterators in VB.NET

Here is a nice sample on how to implement it
http://hccweb1.bai.ne.jp/tsune-1/VisualBasic/iterator.html