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ow that you know something about writing database queries, it s time to turn your attention to the different aspects of data modification, such as retrieving, inserting, updating, and deleting data. In this chapter, we ll cover the following: Retrieving data Using SELECT INTO statements Inserting data Updating data Deleting data
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CHAPTER 2: Directory Services Clients
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Figure 11-10. Main Content web page demonstration You will also notice a welcome message displaying the user who just logged in (upper left corner). Let s examine how all this was achieved. It all begins with the login code on the Login.aspx Web Form: Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click If Membership.ValidateUser(textUsername.Text, textPassword.Text) Then FormsAuthentication.RedirectFromLoginPage(textUsername.Text, False) Else Response.Write("Invalid Login!") End If End Sub Here within the Click event of the Login button, you use the Membership.ValidateUser method along with passing in the username and password. This method returns a Boolean value indicating whether the user s credentials are valid or not. After the credentials are verified, you are redirected to the Default.aspx Web Form, which is the home page of your content. The welcome message located in the upper left corner is displayed by the following code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim currentuser As MembershipUser = Membership.GetUser() labelWelcome.Text = "Welcome " & currentuser.UserName End Sub
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In this exercise, you ll create a simple registration form that accepts a first and last name. When someone presses the button to register, a modal window will appear with a terms and conditions notice that users must agree to before proceeding. You won t fully code the registration form, you ll just send a result to a TextBlock so you can see what s going on. Let s get started.
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This chapter covered the fundamentals of XML that every Visual Basic .NET programmer needs to know. It also showed you how to use the most frequently used T-SQL features for extracting XML from tables and querying XML documents like tables. Finally, we discussed the xml data type and gave you some practice using it. How much more you need to know about XML or T-SQL and ADO.NET facilities for using XML documents depends on what you need to do. As for many developers, this chapter may be all you ever need to know and understand. If you do more sophisticated XML processing, you now have a strong foundation for experimenting on your own. In the next chapter, you will learn about database transactions.
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Firestarter works by controlling the data that goes into and out of your computer via your Internet or network connection. By default, it blocks every type of uninvited inbound connection but allows every type of outbound connection. Whenever you click a link on a web page, your computer sends a request for data to the web server hosting the web page. Within a few milliseconds, that data will be sent to your computer. This is an inbound data connection. The Linux firewall is clever enough to realize that the data was requested by you, so it is allowed through. However, any uninvited connections are turned away. If, out of the blue, someone attempts to connect to your computer via the popular Secure Shell (SSH) tool, as just one example, he won t be allowed to make that connection. This is a good thing, because it makes your computer secure. Crackers are turned away whenever they try to connect, no matter how they try to connect. But in some circumstances, allowing uninvited connections is useful. For example, if you create a shared folder for other computers in your office to connect to, they will frequently make uninvited inbound connections to your computer whenever they want to grab a file. And if you want to make use of SSH to connect to your computer remotely, you will need to allow such incoming connections. Therefore, Firestarter lets you allow through certain types of inbound connections. In the terminology of Firestarter (and many firewall programs), outbound traffic is any kind of data originating on your computer that is sent out on the network and/or Internet. By default, Firestarter allows out all data, no matter what it is. This is described as a permissive policy. But Firestarter can be configured to block all outgoing connections apart from those you configure Firestarter to allow. This is described as a restrictive policy and can be useful in blocking certain types of programs that phone home with personal data about you, such as spyware.
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Module Module1 <Table(Name:="Customers")> _ Public Class Customers
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To get a feel for the number of COM components installed on a Windows system, you can use a few lines of F# using fsi.exe as a shell:
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q: (Stands for query) Allows you to sort results based on keywords. l: (Stands for location) Accepts an address or a ZIP code. radius: Accepts a number and represents the distance in miles to retrieve results.
public MainPage() { InitializeComponent(); this.FavoriteColor.ItemsSource = new string[] { "aqua", "azure", "beige", "black", "blue", "brown", "cyan", "gold", "gray", "ivory", "lime", "magenta", "maroon", "navy", "olive", "orange", "pink", "purple", "red", "tan", "teal", "violet", "wheat", "white", "yellow" }; } When this control is displayed and a user starts to type in the textbox, the colors matching the typed text are displayed below in a list, as shown in Figure 6-7.
finally { // Clean up code. if (r != nullptr) delete r; }
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