How to achieve Single Sign On service in .NET? Does the .NET provide a mechanism for Single Sign On?

Sure , .Net provides a Mechanism for SSO if you want to achieve this goal kindly visit the following links for more details on how to apply the SSO Mechanism in Asp.net : http://www.codeproject.com/Articles/236424/Single-Sign-On-SSO-for-NET http://www.codeproject.com/Articles/27576/Single-Sign-on-in-ASP-NET-and-Other-Platforms Thanx...

this article show single-sign in asp.net http://www.codeproject.com/Articles/106439/Single-Sign-On-SSO-for-cross-domain-ASP-NET-applic

This article lists all the important points to take into account when creating a Single Sign-On system.
The principle of SSO may seem simple to explain, but in reality it implies numerous functionalities that are important to take into account from the beginning of a project to avoid very costly changes later.
read more http://www.codeproject.com/Articles/429166/Basics-of-Single-Sign-on-SSO http://www.codeproject.com/Articles/106439/Single-Sign-On-SSO-for-cross-domain-ASP-NET-applic http://msdn.microsoft.com/en-us/library/ms972971.aspx

check out this areticle, it's quite helpfull...
http://www.codeproject.com/Articles/27576/Single-Sign-on-in-ASP-NET-and-Other-Platforms