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Note that in both these cases the order in which the three users are listed is unimportant. However, it is important that these users are denied before you include the <allow> rule. For example, the following authorization rules won t affect the user jenny, because ASP.NET matches the rule that allows all users and doesn t read any further: <authorization> <deny users=" " /> <deny users="dan,matthew" /> <allow users="*" /> <deny users="jenny" /> </authorization> When creating secure applications, it s often a better approach to explicitly allow specific users or groups and then deny all others (rather than denying specific users, as in the examples so far). Here s an example of authorization rules that explicitly allow two users. All other user requests will be denied access, even if they are authenticated. <authorization> <deny users=" " /> <allow users="dan,matthew" /> <deny users="*" /> </authorization> You should consider one other detail. The format of user names in these examples assumes forms authentication. In forms authentication, you assign a user name when you call the RedirectFromLoginPage() method. At this point, the UrlAuthorizationModule will use that name and check it against the list of authorization rules. Windows authentication is a little different, because names are entered in the format DomainName\UserName or ComputerName\UserName. You need to use the same format when listing users in the authorization rules. For example, if you have the user accounts dan and matthew on a computer named FARIAMAT, you can use these authorization rules: <authorization> <deny users=" " /> <allow users="FARIAMAT\dan,FARIAMAT\matthew" /> <deny users="*" /> </authorization>

It is also possible to populate the data of a new DataTable easily, based on the results of a LINQ query and provided that you are not using projections. When you have a result set where the underlying type can be represented as IEnumerable<T>, you can call the CopyToDataTable<T>() extension method on the result, as in this example: static void BuildDataTableFromQuery(DataTable data) { var cars = from car in data.AsEnumerable() where car.Field<int>("CarID") > 5 select car; // Use this result set to build a new DataTable. DataTable newTable = cars.CopyToDataTable();

Make sure you specify the computer or domain name in the users attribute when you use Windows authentication. You can t use an alias such as localhost, because this will not be successfully matched.

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// Print the DataTable. for (int curRow = 0; curRow < newTable.Rows.Count; curRow++) { for (int curCol = 0; curCol < newTable.Columns.Count; curCol++) { Console.Write(newTable.Rows[curRow][curCol].ToString().Trim() + "\t"); } Console.WriteLine(); } }

A common application design is to place files that require authentication into a separate directory. With ASP.NET configuration files, this approach is easy. Just leave the <authorization> element in the normal parent directory empty, and add a web.config file that specifies stricter settings in the secured directory. Remember that when you add the web.config file in the subdirectory, it shouldn t contain any of the application-specific settings. In fact, it should contain only the authorization information, as shown here: <configuration> <system.web> <authorization> <deny users=" " />

Note It is also possible to transform a LINQ query to a DataView type by using the AsDataView<T>() extension method.

You cannot change the <authentication> tag settings in the web.config file of a subdirectory in your application. Instead, all the directories in the application must use the same authentication system. However, each directory can have its own authorization rules.

You might find this technique helpful when you wish to use the result of a LINQ query as the source of a data binding operation. Recall that the DataGridView of Windows Forms (as well as an ASP.NET or WPF grid control) supports a property named DataSource. You could bind a LINQ result to the grid as follows: // Assume myDataGrid is a GUI-based grid object. myDataGrid.DataSource = (from car in data.AsEnumerable() where car.Field<int>("CarID") > 5 select car).CopyToDataTable(); This wraps up the examination of the disconnected layer of ADO.NET. Using this aspect of the API, you can fetch data from a relational database, munch on the data, and return it for processing while keeping the database connection open for the shortest possible amount of time.

public UserDaoTraditionalJdbcImpl(String driverClassName, String url, String username, String password) { this.driverClassName = driverClassName;

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