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Authentication, such as checking your photo identification, verifies your identity by requiring you to provide unique credentials that are not easily impersonated. Authorization, such as checking your plane ticket, verifies that you have permission to perform the action you are attempting. Authentication, determining who you are, must happen before authorization, which determines whether you are allowed to access a resource. The WindowsIdentity class provides .NET Framework applications access to a Windows user s account properties. You can examine the current user s user name and authentication type by creating a new WindowsIdentity object by using the WindowsIdentity.GetCurrent method. The WindowsPrincipal class enables assemblies to query the Windows security database to determine whether a user is a member of a particular group. To examine the current user s group memberships, create a WindowsPrincipal object by using the current user s identity and then call the WindowsPrincipal.IsInRole method.

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A file with an .ashx extension is called an ASP.NET Web handler file, and it is used to handle raw HTTP requests received by ASP.NET.

The RadioButton control is used to present exclusive options to the user. The hypo thetical pizza order form in Figure 3-7 demonstrates the use of RadioButton controls, allowing the user to choose either a pizza or a calzone but not both. Table 3-11 shows important properties of the RadioButton control.

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Windows Server 2003 supports two types of storage, basic and dynamic, and several file systems, including FAT, FAT32, and NTFS. Most advanced storage management features are available only on dynamic disk volumes formatted as NTFS. Dynamic disks provide flexible and powerful options in configurations with more than one disk. You can implement spanned, mirrored, striped, and RAID-5 volumes to provide storage according to capacity, performance, and fault-tolerance requirements. Disk volumes can be corrupted, can become fragmented, and often fill to capacity. Check Disk, Disk Defragmenter, and Disk Quotas are tools to help you manage existing volumes. Not all RAID configurations are fault tolerant mirrored and RAID-5 volumes are fault tolerant, but striped volumes are not. None of the Windows Server 2003 volume types will provide fault tolerance if more than one disk fails in the volume.

Audits events such as program activation and process exit. See the explanatory text for this policy in GPME.

Create a simple table without indexes, insert 1,000,000 rows into the table, and write down the query cost and execution time. Add one non-clustered index to the table, truncate the table, re-insert the 1,000,000 rows, and write down the query cost

Permissions have changed on one of the systems. Your administrative privileges have been taken away. Computer1 is not available on the network. The telnet service is not running on Computer1. An IPSec policy is in place on Computer1 and something is wrong with it.

When errors are encountered during the processing of DataRows, a value is added to the RowError property. The RowError property is a string that is typically set to an error message describing the error, but it can be set to any string and used as needed in your application. Once a DataRow.RowError property is assigned, the DataTable.HasErrors property is automatically set to True, indicating errors exist in the DataTable. When it is determined that errors exist, you can use the DataTable.GetErrors method to return an array of DataRows containing all rows that have errors or, more specifically, all rows with a RowError value other than null (nothing, or the empty string). To remove an error, set the DataRow.RowError property to an empty string.

' VB Dim coll As New ArrayList() ' Add individual items to the collection Dim s As String = "Hello" coll.Add(s) coll.Add("hi") coll.Add(50) coll.Add(New Object()) // C# ArrayList coll = new ArrayList(); // Add individual items to the collection string s = "Hello"; coll.Add(s); coll.Add("hi"); coll.Add(50); coll.Add(new object());

If you want to provide users with more robust HTML capabilities, it will be almost impossible to prevent CSS exploits. Unfortunately, even the most mundane HTML tags can be used to launch client-side scripts on some browsers. For example, each of the following tags can cause a browser (but not necessarily all browsers, or even any mod ern browser) to run client-side code:

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