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and Strongly Named Assemblies . The compiler will scan all of the referenced assemblies looking for the type s definition . Once the compiler finds the proper assembly, the assembly information and the type information is emitted into the resulting managed module s metadata . To get the assembly information, you must pass the assembly that defines any referenced types to the compiler . The C# compiler, by default, automatically looks in the MSCorLib .dll assembly even if you don t explicitly tell it to . The MSCorLib .dll assembly contains the definitions of all of the core Framework Class Library (FCL) types, such as Object, Int32, String, and so on . As you might imagine, there are some potential problems with the way that compilers treat namespaces: it s possible to have two (or more) types with the same name in different namespaces . Microsoft strongly recommends that you define unique names for types . However, in some cases, it s simply not possible . The runtime encourages the reuse of components . Your application might take advantage of a component that Microsoft created and another component that Wintellect created . These two companies might both offer a type called Widget Microsoft s Widget does one thing, and Wintellect s Widget does something entirely different . In this scenario, you had no control over the naming of the types, so you can differentiate between the two widgets by using their fully qualified names when referencing them . To reference Microsoft s Widget, you would use Microsoft.Widget, and to reference Wintellect s Widget, you would use Wintellect.Widget . In the following code, the reference to Widget is ambiguous, so the C# compiler generates the following message: "error CS0104: 'Widget' is an ambiguous reference":

Organizational domains These domains are named using a three-character code that indicates the primary function or activity of the organizations contained within the DNS domain. Some organizational domains can be used globally, although others are used only for organizations within the United States. Most organizations located in the United States are contained within one of these orga nizational domains. Geographical domains These domains are named using the two-character country and region codes established by the International Organization for Stan dardization (ISO) 3166, such as uk (United Kingdom) or it (Italy). These domains are generally used by organizations outside the United States, but this is not a requirement. Reverse domains These are special domains, named in-addr.arpa, that are used for IP-address-to-name mappings (referred to as reverse lookups).

In November 2000, ICANN announced seven additional top-level domains:

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using Microsoft; // Try prepending "Microsoft." using Wintellect; // Try prepending "Wintellect." public sealed class Program { public static void Main() { Widget w = new Widget();// An ambiguous reference } }

using System.Web.Services; namespace RunningTotal { [WebService(Namespace="http://www.mycompany.com")] public class Total : WebService { [WebMethod(EnableSession=true)] public int AddToTotal(int p_new_value) { if (Session["Total"] == null) { Session["Total"] = 0; } Session["Total"] = (int)Session["Total"] + p_new_value; return (int)Session["Total"]; }

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To remove the ambiguity, you must explicitly tell the compiler which Widget you want to create:

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using Microsoft; // Try prepending "Microsoft." using Wintellect; // Try prepending "Wintellect." public sealed class Program { public static void Main() { Wintellect.Widget w = new Wintellect.Widget(); // Not ambiguous } }

Important For the most up-to-date information about these new top-level domains, consult http://www.icann.org/tlds.

The example demonstrates maintaining a running total for each client; the total is persistent between invocations from the same client but isn't shared between clients.

Beneath the top-level domains, ICANN and other Internet naming authorities, such as Network Solutions or Nominet (in the United Kingdom), delegate domains to various organizations such as Microsoft (microsoft.com) or Carnegie Mellon University (cmu.edu). These organizations connect to the Internet, assign names to hosts within their domains, and use DNS servers to manage the name-to-IP-address mappings within their portion of the namespace. These organizations can also delegate subdo mains to other users or customers. ISPs, for example, receive a delegation from ICANN and can delegate subdomains to their customers.

There s another form of the C# using directive that allows you to create an alias for a single type or namespace . This is handy if you have just a few types that you use from a namespace and don t want to pollute the global namespace with all of a namespace s types . The following code demonstrates another way to solve the ambiguity problem shown in the preceding code:

In addition to the top-level domains on the Internet, organizations can also have a pri vate namespace: a DNS namespace based on a private set of root servers independent of the Internet s DNS namespace. Within a private namespace, you can name and cre ate your own root server or servers and any subdomains as needed. Private names cannot be seen or resolved on the Internet. An example of a private domain name is mycompany.local.

using Microsoft; // Try prepending "Microsoft." using Wintellect; // Try prepending "Wintellect." // Define WintellectWidget symbol as an alias to Wintellect.Widget using WintellectWidget = Wintellect.Widget; public sealed class Program { public static void Main() { WintellectWidget w = new WintellectWidget(); // No error now } }

The .NET Framework allows the programmer to create a proxy class that represents an XML Web service. This proxy takes the form of a source file, which can be compiled and used as part of a client application; the class appears as a local type and accesses the XML Web service transparently.

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