This is an online tutorial that can be utilized by the web developers to gather knowledge on creating ASP.NET applications in a secured manner. This article starts with analyzing about the security related problems that occur in applications development and discusses about its solutions. This tutorial is provided with trouble shooting tips to let the users gather information on authentication, secure communication and authorization issues. Authentication issues such as IIS authentication, forms authentications and Windows authentications are elaborately discussed. Refferal websites are given for users.