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For example, you initialize an implicitly typed local variable from the return type of a method, and as you develop your method, you might decide to change its return type If you do this, the compiler will automatically figure out that the return type has changed and automatically change the type of the variable! This is great, but of course, other code in the method that uses that variable may no longer compile if the code accesses members using the variable assuming that it was the old type In Microsoft Visual Studio, you can hold the mouse cursor over var in your source code and the editor will display a tooltip showing you the type that the compiler infers from the expression C# s implicitly typed local variable feature must be used when working with anonymous types within a method; see 10, Properties, for more details .

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You cannot declare a method s parameter type using var The reason for this should be obvious to you since the compiler would have to infer the parameter s type from the argument being passed at a callsite and there could be no call sites or many call sites In addition, you cannot declare a type s field using var There are many reasons why C# has this restriction One reason is that fields can be accessed by several methods and the C# team feels that this contract (the type of the variable) should be stated explicitly Another reason is that allowing this would permit an anonymous type (discussed in 10) to leak outside of a single method Important Do not confuse dynamic and var Declaring a local variable using var is just a.

GetHostName()

As previously discussed, a Windows Server 2003 VPN server can be configured with either Windows or RADIUS as its authentication or accounting provider. RADIUS provides a centralized AAA service when you have multiple VPN servers or a mix of heterogeneous dial-up and VPN equipment. RADIUS is the preferred choice when multiple technologies need authentication services. For instance, if you are running VPN services and wireless 802.1x services on your corporate network, RADIUS can handle the AAA services for both systems simultaneously thus giving single sign-on to both systems and making them use one common authenti cation service. When you configure Windows as the authentication provider, the VPN server performs the authentication of the VPN connection by communicating with a domain controller. The VPN server does this by using a secure remote procedure call (RPC) channel and authorizing the connection attempt through the dial-in properties of the user account and locally configured remote access policies. When you configure RADIUS as the authentication provider, the VPN server relies on a RADIUS server to perform both the authentication and authorization. When a VPN connection is attempted, the VPN client credentials and other connection parameters are used to create a RADIUS Access-Request message that is sent to the configured RADIUS server. If the connection attempt is both authenticated and authorized, the RADIUS server sends back a RADIUS Access-Accept message. If the connection attempt is either not authenticated or not authorized, the RADIUS server sends back a RADIUS Access-Reject message.

Obviously, it is preferable to have the interface method strongly typed, and this is why the FCL includes a generic IComparable<in T> interface . Here is the new version of the code revised by using the generic interface:

FIGURE 3-23 Notes Page view, showing a well-designed slide and a well-designed handout with the complete verbal explanation of the slide.

if ( ( a && !c ) || ( a && b && c ) ) { category = 1; } else if ( ( b && !a ) || ( a && c && !b ) ) { category = 2; } else if ( c && !a && !b ) { category = 3; } else { category = 0; }

Implementing VPNs 10-49

10

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