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Sample of Visual Basic Code Protected Sub ButtonShowHide_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles ButtonShowHide.Click Panel1.Visible = Not Panel1.Visible If Panel1.Visible Then ButtonShowHide.Text = "Login: hide form" Else ButtonShowHide.Text = "Login: show form" End If End Sub Sample of C# Code protected void ButtonShowHide_Click(object sender, EventArgs e) { Panel1.Visible = !Panel1.Visible; if (Panel1.Visible) { ButtonShowHide.Text = "Login: hide form"; } else { ButtonShowHide.Text = "Login: show form"; } }
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Populating the Label control with data from an untrusted source can create cross-site scripting (XSS) vulnerabilities. This is true for many of the controls that contain a Text property. The data applied to the Text property of the control can contain HTML code and script that will be executed by the page. To prevent this, use the HttpUtility.HtmlEncode method or the Server.HtmlEncode method to encode the untrusted data prior to placing it in the Text property.
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You ll notice that the String and StringBuilder classes don t have full method parity; that is, String has ToLower, ToUpper, EndsWith, PadLeft, PadRight, Trim, and so on . The StringBuilder class doesn t offer any of these methods . On the other hand, the StringBuilder class offers a richer Replace method that allows you to replace characters or strings in a portion of the string (not the whole string) . It s unfortunate that there isn t complete parity between these two classes because now you must convert between String and StringBuilder to accomplish certain tasks . For example, to build up a string, convert all characters to uppercase, and then insert a string requires code like this:
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System.Object-derived types System.Net.Mail.SmtpClient System.Deployment.Application.ApplicationDeployment System.Deployment.Application.InPlaceHostingManager System.Activities.WorkflowInvoker System.ServiceModel.Activities.WorkflowControlClient System.Net.PeerToPeer.PeerNameResolver System.Net.PeerToPeer.Collaboration.ContactManager System.Net.PeerToPeer.Collaboration.Peer System.Net.PeerToPeer.Collaboration.PeerContact System.Net.PeerToPeer.Collaboration.PeerNearMe System.ServiceModel.Discovery.AnnouncementClient System.ServiceModel.Discovery.DiscoveryClient
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For more details on regular expressions, please refer to the .NET Framework documentation . Note The printed code is formatted to be more readable in the book; in practice the complete
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When your method finishes processing the resource and returns, the ReaderWriterGate object will invoke whatever method you passed to BeginRead s or BeginWrite s asyncCallback parameter; this is how you know when the operation completed . So now, let s return to our Web server discussion . A client makes a request to write to a resource, so a thread pool thread calls ReaderWriterGate s BeginWrite method . While the thread is processing the callback method, another client makes a request . The thread pool creates a new thread, and this thread calls BeginRead . The ReaderWriterGate object sees that reading is not allowed at this time and it adds the callback delegate to an internal queue . The queue is a collection class, and it needs to be manipulated in a thread-safe way, so a lock is taken around the manipulation of the collection . However, the lock is held only while items are being added and removed from the queue, which requires a very short amount of time . This means that other threads also using the ReaderWriterGate will not block for long (if at all)! After the callback delegate has been added to the queue, the thread pool thread returns to the pool . As more client requests come in, the same thread pool thread keeps waking up and calling BeginRead, adding more and more delegates to the internal queue . So now the server has only two threads in it doing all the work . When the first thread finishes writing to the resource, it returns from the callback method to the ReaderWriterGate object . The ReaderWriterGate sees that there are a bunch of delegates in its internal queue, so it posts all these delegates to the CLR s thread pool . Again, a lock has to be taken around the manipulation of the queue, but the lock is held just long enough to queue its callback delegates into the thread pool . The thread pool then spans this work out over the cores using no more threads than there are cores, and so no context switching occurs .9 Now, we have a scalable server that uses very little resources and runs with great performance . A ReaderWriterGate object has another internal queue for delegates that wish to write to the resource . When a write request shows up, any incoming reader delegates get queued so that the current reader methods can finish and drain out of the gate . After the thread pool threads have finished processing the previously queued reader methods, a single writer delegate is queued to the thread pool . This is how I ensure that only other thread is calling a writer method at any given time . More details about the ReaderWriterGate can be found here: /en-us/magazine/cc163532.aspx. After I came up with this idea, I sold the patent rights to
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Dividing your storage space into logical partitions in this way makes backups and disaster recovery easier and allows you to focus your efforts on the critical data partition.
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Table 15-3: HookImportedFunctionsByName Parameter Descriptions Parameter hModule szImportMod UiCount Description The module in which the imports will be hooked. The name of the module whose functions are imported. The number of functions to hook. This parameter is the size of the paHookArray and paOrigFuncs arrays. 544
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// Create and populate the default container with application configuration. var container = new UnityContainer() .AddNewExtension<EnterpriseLibraryCoreExtension>();
However, imagine that the stored procedure s inputs vary considerably in selectivity some invocations have high selectivity whereas others have low selectivity . For example, the following code invokes the stored procedure with an input that has low selectivity:
Test UI automation tests Unit tests Description Limited range of acceptance testing; these drive the application from the user perspective. Validate the implementation of a class.
Sample of C# Code protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { NameTextBox.Text = Profile.Name; if (Profile.PostalCode > 0) { PostalTextBox.Text = Profile.PostalCode.ToString(); } if (Profile.ColorPreference.Length > 0) { ColorsDropDownList.SelectedValue = Profile.ColorPreference.ToString(); } } }
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