Calling Page Methods in C# ASP.NET

Add Script Message Windows Dinamically

Adiciona a la Default.aspx los constroles Button y TextBox
En el evento OnClick del Button escribe:

Secure Web Service

MSDN Building Secure Web Services
CodeProject: An introduction to Web Service Security using WSE
Securing .NET Web Services with the WS-Security Protocol

Find duplicate values in SQL

SELECT user, COUNT(user) AS cant
FROM adm_users
GROUP BY user
HAVING COUNT(user)>1

Silverlight web application

MSDN First Silverlight web application (video & code)
MSDN Silverlight (videos)
MSDN Silverlight 5 Beta

Adding, Reading & Modifying Master Pages Dynamically

MSDN Accessing Members & Attaching Master Pages Dynamically
CodeProject: Adding content to Master Pages Dynamically

Dynamic Themes

MSDN ASP.NET Themes and Skins
MSDN How to: Apply ASP.NET Themes Programmatically
CodeProject: Dynamic Themes in ASP.NET 2.0