ASP.NET PDF Viewer using C#, VB/NET

he goal of this chapter is twofold. The first order of business is to provide you with a highlevel overview of various security technologies the .NET base class libraries offer. You ll learn the role of strongly named assemblies, hash codes and role-based security (RBS) systems. Do understand, however, that we will not be diving into each and every detail regarding these topics. Rather, this information will give you a context for the major mission of this chapter, which we outline under the second order of business. Our second (major) task with this chapter is to address the details of securing ASP .NET web applications using Windows-based and Forms-based authentication. Once you understand the basics behind each model, you will learn how to implement Forms-based authentication under ASP .NET 2.0. As you will see, developers can use numerous new techniques (including the Membership and Roles classes, server-side security controls, and cookieless authentication) that simplify the process. We ll then wrap up the chapter by examining a (much welcomed) Web-based UI editor for web.config files.

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In 10g, Oracle provides you with a pseudo column that allows you to implement optimistic locking without adding a shadow column in your tables or without computing a checksum. The pseudo column ora_rowscn returns the conservative upper-bound system change number (SCN) of the most recent change to the row. The SCN is a number assigned to a transaction after it is committed. Oracle records this number with the transaction s redo entries in the redo log.

Type abbreviations are the simplest type definitions: type index = int type flags = int64 type results = string * TimeSpan * int * int It is common to use lowercase names for type abbreviations, but it s certainly not compulsory. Type abbreviations can be generic: type StringMap<'a> = Microsoft.FSharp.Collections.Map<string,'a> type Projections<'a,'b> = ('a -> 'b) * ('b -> 'a) Type abbreviations are not concrete, because they simply alias an existing type. Type abbreviations are expanded during the process of compiling F# code to the format shared between multiple .NET languages. The difference can, for example, be detected by other .NET languages, and because of this, a number of restrictions apply to type abbreviations. For example, you cannot augment type abbreviations with additional members, as can be done for concrete types such as records, discriminated unions, and classes. In addition, you cannot truly hide a type abbreviation using a signature or private declaration (see 7).

Let s look at a simple example. We create a table, t1, and insert three numbers in it: scott@ORA10G> create Table created. scott@ORA10G> insert 1 row created. scott@ORA10G> insert 1 row created. scott@ORA10G> insert 1 row created. table t1 ( x number ); into t1 values ( 1 ); into t1 values ( 1 ); into t1 values ( 22);

Historically speaking, security is often perceived by many in the Windows programming community as someone else s problem. Because security programming using the raw Win32 APIs is so complex and tedious, few developers relish the idea of diving into the gory details. Rather, these same (often well-intentioned) individuals attempted to pass the buck to the security guy/gal. To make matters worse, many (again, well-intentioned) software companies often view security as an afterthought that is bolted onto an almost-completed product. Unless you happen to be a security-savvy individual who works at a security-savvy company, it is too often the case that the security is not factored into the initial design of a system. As you would guess, this approach seldom results in truly secure or extendable software. Thankfully, the .NET platform has greatly simplified the process of building secure applications. Not only can .NET developers utilize a well-designed set of namespaces, they can also leverage design time support provided by the Visual Studio 2005 integrated development environment (IDE). Since the initial release of the .NET platform, Microsoft has made it quite clear that security is a critical topic that must be addressed during an application s initial design. Not only has Microsoft designed a whole set of security best practices, it has also integrated security into the very fabric of the base class libraries. To better understand the reach of .NET security, consider the .NET 2.0 security-centric namespaces shown in Table 5-1.