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<authorization> <allow users="*" /> </authorization> This rule is rarely required, because it s already present in the machine.config file. After ASP .NET applies all the rules in the web.config file, it applies rules from the machine.config file. As a result, any user who is explicitly denied access automatically gains access. Now consider what happens if you add more than one rule in the authorization section: <authorization> <allow users="*" /> <deny users=" " /> </authorization> When evaluating rules, ASP.NET scans through the list from top to bottom. As soon as it finds an applicable rule, it stops its search. Thus, in the previous case, it will determine that the rule <allow users="*"> applies to the current request and will not evaluate the second line. That means these rules will allow all users, including anonymous users. Reversing the order of these two lines, however, will deny anonymous users (by matching the first rule) and allow all other users (by matching the second rule). <authorization> <deny users=" " /> <allow users="*" /> </authorization> When you add authorization rules to the web.config file in the root directory of the web application, the rules automatically apply to all the web resources that are part of the application. If you ve denied anonymous users, ASP.NET will examine the authentication mode. If you ve selected forms authentication, ASP.NET will direct the user to the login page. If you re using Windows authentication, IIS will request user credentials from the client browser, and a login dialog box may appear (depending on the protocols you ve enabled). In the following sections, you ll learn how to fine-tune authorization rules to give them a more carefully defined scope.

Console.WriteLine("Here are the red cars we have in stock:"); foreach (var item in cars) { Console.WriteLine("-> CarID = {0} is {1}", item.ID, item.Make); } }

The <allow> and <deny> rules don t need to use the asterisk or question mark wildcards. Instead, they can specifically identify a user name or a list of comma-separated user names. For example, the following authorization rule specifically restricts access from three users. These users will not be able to access the pages in this directory. All other authenticated users will be allowed. <authorization> <deny users=" " /> <deny users="dan" /> <deny users="jenny" /> <deny users="matthew" /> <allow users="*" /> </authorization> You can also use a comma-separated list to deny multiple users at once. Here s an equivalent version of the previous example that uses only two authorization rules: <authorization> <deny users=" " /> <deny users="dan,jenny,matthew" /> <allow users="*" /> </authorization>

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One undesirable aspect of the current LINQ query expression is that you use numerous casting operations and DataRow indexers to gather the result set, which could result in runtime exceptions if you attempt to cast to an incompatible data type. To inject some strong typing into your query, you can use the Field<T>() extension method of the DataRow type. Doing so lets you increase the type safety of your query because the compatibility of data types is checked at compile time. Consider the following update: var cars = from car in data.AsEnumerable() where car.Field<string>("Color") == "Red" select new { ID = car.Field<int>("CarID"), Make = car.Field<string>("Make") }; In this case, you can invoke Field<T>() and specify a type parameter to represent the underlying data type of the column. As an argument to this method, you pass in the column name itself. Given the additional compile-time checking, you should consider it a best practice to use Field<T>() (rather than the DataRow indexer) when you process the roles of a EnumerableRowCollection. Beyond the fact that you call the AsEnumerable() method, the overall format of the LINQ query is identical to what you have already seen in 13. Given this, there is no reason to repeat the details of the various LINQ operators here. If you wish to see additional examples, you can look up the topic LINQ to DataSet Examples in the .NET Framework 4.0 SDK documentation.

public class UserDaoTraditionalJdbcImpl implements UserDao { private private private private String String String String driverClassName; url; username; password;

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