Working with User Accounts in Windows XP Home Edition in visual C#.net

Create DataMatrix in visual C#.net Working with User Accounts in Windows XP Home Edition

Enforcing Data Integrity
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Most Web sites require that only certain members be allowed to see certain pages. How should you specify that in a site map The most effective and efficient approach is using roles. Basically, you associate each node in the site map with a list of authorized roles, and the ASP.NET infrastructure guarantees that no unauthorized users will ever view that page through the site map. This approach is advantageous because you define roles and map them to users once for security purposes and membership and use them also for site maps. A feature known as site map security trimming provides a way to hide navigational links in a site map based on security roles. Enabled on the site map provider and individual nodes, security trimming serves user-specific views of a site. It does only that, though. It hides links from view whenever the content of the site map is displayed through hierarchical UI controls such as TreeView and Menu. However, it doesn t block users from accessing pages by typing the URL in the address bar of the browser or following links from other pages. For ensuring that unauthorized users don t access pages, you need to configure roles and bind them to the identity of the connected user. (See 19, ASP.NET Security. ) By default, nonprogrammatic access to .sitemap files is protected and results in a forbidden resource ASP.NET exception. Be aware of this, if you plan to replace the default site map configuration and use files with a custom extension. In this case, make sure you explicitly prohibit access to these files through IIS. To further improve security, grant NETWORK SERVICE or ASPNET the ASP.NET runtime accounts read-only access to these custom site map files. If you store site maps in a database, configure any involved tables to make them accessible to the smallest number of accounts with the least possible set of privileges.
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Structure POINTAPI Dim X As Integer Dim Y As Integer End Structure Structure MINMAXINFO Dim ptReserved As POINTAPI Dim ptMaxSize As POINTAPI Dim ptMaxPosition As POINTAPI Dim ptMinTrackSize As POINTAPI Dim ptMaxTrackSize As POINTAPI End Structure
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The File and Settings Transfer Wizard is a user-based migration tool that allows users to transfer their configuration settings and data from one computer to another. Although not designed for corporate deployments or mass migrations, it can allow users to transfer their settings, files, and folders from one computer to another without requiring administrative assistance. This tool is installed on clients running Windows XP in the System Tools menu. Click Programs or All Programs, Accessories, System Tools, File Settings And Transfer Wizard.
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5. Click Current, and then click Select. 6. Click Unstarted Tasks, and then click Edit.
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Connecting to a Data Source
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High Availability
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Part 1: Part Title
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192.168.10.254 and has an exclusion range of 192.168.10.1 to 192.168.10.202. Here, 254 IP addresses are again available, which could be used to service 200 or more clients the bulk of which are located on the primary subnet. You are using the remote DHCP server on a smaller subnet as a backup. If the primary server were to go down, the backup could respond to client requests and handle their leases. When the primary came back online, it would handle the majority of client leases because it is located on the primary subnet closer to the bulk of the client computers. Again, you achieve basic fault tolerance and availability. Although this approach is designed to provide some redundancy and fault tolerance, it is possible that the primary would be offline too long and the backup DHCP server would run out of available IP addresses. If this were to happen, no IP addresses would be available to clients seeking new leases, and they would be configured to use APIPA.
Classes in the .NET Framework let you read the value of existing performance counters and create your own counters as well. If your application creates and updates one or more performance counters, you can then use standard tools such as the Perfor mance utility (see Figure 19-4) to monitor the performance of your code. Or you can create another .NET application to periodically check the performance counters of your main application, create logs, and maybe automatically fine-tune one or more crit ical settings while the application is running on the end user s machine.
Overriding the OnPaint Method By overriding the OnPaint method, you direct the runtime to draw a round button, instead of the usual rectangular button. Create the OnPaint method 1. If you re using Visual Basic, click RoundButton (Overrides) in the Class List, and then click OnPaint in the Method Name list. The following empty method definition is added to the class. You can also simply type this method into the editor. 2. Visual Basic 3. Protected Overrides Sub OnPaint(ByVal pevent As _ 4. System.Windows.Forms.PaintEventArgs) 5. 6. End Sub If you re using Visual C#, in the Class View expand the Bases And Interfaces nodes of the RoundButton class button until you find the ButtonBase class. Expand the ButtonBase node, right-click the OnPaint method, point to Add and click Override on the shortcut menu. The following empty method definition is added to the class. You can also simply type this method into the editor. // Visual C# protected override void OnPaint( System.Windows.Forms.PaintEventArgs pevent) { } The OnPaint method is called each time the control is drawn on the form. The base class draws the familiar rectangle. By overriding the OnPaint method, you can determine the appearance of the button. 7. Add the following code to draw the round button. Not only will the button be round when it s painted on the form, but the clickable area of the button will be round as well. 8. 9. 11. 12. 13. 14. 15. 17. 18. // Visual C# 19. protected override void OnPaint( 20. System.Windows.Forms.PaintEventArgs pevent) { 21. 22. this.Size = new Size(50,50); System.Drawing.Drawing2D.GraphicsPath aCircle = Visual Basic Protected Overrides Sub OnPaint(ByVal pevent As _ Me.Size = New Size(50, 50) Dim aCircle As System.Drawing.Drawing2D.GraphicsPath = _ New System.Drawing.Drawing2D.GraphicsPath() aCircle.AddEllipse(New System.Drawing.RectangleF(0, 0, 50, 50)) Me.Region = New Region(aCircle)
The rst statement in this method declares an int variable called lhs and initializes it with the integer corresponding to the value typed by the user in the lhsOperand text box. Remember that the Text property of a text box control contains a string, so you must convert this string to an integer before you can assign it to an int variable. The int data type provides the int.Parse method, which does precisely this. The second statement declares an int variable called rhs and initializes it to the value in the rhsOperand text box after converting it to an int. The third statement declares an int variable called outcome.
Using Blocks to Group Statements
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DataSet DataRow DataRow DataRow Deleted DataAdapter Modified UpdateCommand DeleteCommand Database
Microsoft SQL Server 2005 Administration
The Gantt Chart view appears. Before you create a filter, you ll quickly see the tasks that you re interested in by applying an AutoFilter.
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