Applied on: Windows hosting (ASP) plan
Web Application Security
The Open Web Application Security Project (OWASP) offers various videos. These short videos are for explaining web application security and the most common vulnerabilities (Injection Attacks & Cross Site Scripting). You will found them with simple, easy to understand terms. As a web application security primer, you are recommended to visit https://www.owasp.org/index.php/OWASP_Appsec_Tutorial_Series to see them.
The many useful ‘cheat-sheets’ are also available at OWASP covering topics like Validation of user inputs, Query Parameterization, about PHP security, about HTML5 Security, Authentication and more. You may visit them at https://www.owasp.org/index.php/Cheat_Sheets.
Few ASP.NET-specific resources are below for your understandings:
Resources for securing ASP.NET Applications
OWASP Top 10 for .NET Developers, by Troy Hunt, Microsoft MVP
http://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html
Exploring ASP.NET Validation Controls
http://www.codeproject.com/Articles/426761/Exploring-ASP-NET-Validation-Controls
Design Guidelines for Secure Web Applications
http://msdn.microsoft.com/library/aa302420.aspx
How To Protect From Injection Attacks in ASP.NET
http://msdn.microsoft.com/library/bb355989.aspx
How To Prevent Cross-Site Scripting in ASP.NET
http://msdn.microsoft.com/library/ms998274.aspx
Hope you will find above as central location to add security rich features in your website.