integrate barcode scanner into web application CLASSES AND STRUCTS in C#


Figure 8-18. Three rows returned 9. Again, by clicking the SQL button on the toolbar, the SQL code is exposed. Notice how this differs from the previous example in that TOP (3) has been placed after the SELECT statement. SELECT FROM TOP (3) * CustomerDetails.Customers
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generic <typename T> where T : I ref class G { T t; public: G(T t) { // The handle syntax -> is used // even though T could be a value type. t->F(); } }; int main() { V v; R^ r = gcnew R(); G<V>^ gv = gcnew G<V>(v); G<R^>^ gr = gcnew G<R^>(r); } You might then wonder how you code for situations such as creating objects of the type parameter type inside the generic function or type. If you are to treat the unknown type as a handle, can you use gcnew to create the object, and if so, how In fact, using gcnew is not allowed in a generic type without specifying a constraint on the type parameter that only allows types that support a default constructor to be used. These could be reference types or value types, even though normally you wouldn t use gcnew to create objects of value type.
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Now you can launch the SQL Server Management Studio Express tool. This tool enables you to sign into a database and manipulate its artifacts for creating tables, queries, data, user accounts, and more. When you first launch Management Studio, you will be asked to log into your database. By default, your database will be called MachineName\SQLExpress (see Figure 4-9). You can sign on with your Windows credentials, or if you specified Mixed Mode authentication and wish to, sign on with your SQL Server sa account. With Mixed Mode, you can sign on either way.
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Some additional interesting articles can be found on the Web. The following text describes a few of them that you may find especially interesting.
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The SerializationInfo class holds the data that is serialized or that should be deserialized during the serialization process. In the preceding code example, SerializationInfo is used for writing the customer s data during the serialization process and reading the data during deserialization. Usage example: public void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("FirstName",FirstName); info.AddValue("LastName",LastName); info.AddValue("DateOfBirth",DateOfBirth); info.AddValue("Title",Title); } } You can see this class in 8, where it is used for implementing custom serialization logic for versioning of the serialized types. An important fact is that you can also add subobjects to SerializationInfo as long as they are serializable on their own. But also you have to know up front what to serialize and what needs to be deserialized. The SerializationInfo doesn t include functionality for iterating through all serialized members during deserialization. Therefore, if you want to dynamically add different data to SerializationInfo, you have to work with objects like an ArrayList. More information on MSDN: frlrfsystemruntimeserializationserializationinfoclasstopic.asp
database table. If a name does not match, the data table will not have any data inside that particular column.
Tip The small bar marks the leftmost boundary of the notification area. To resize the notification area,
s = "Feel it, grab it, grope it.\n"; String::Concat(s, "Follow every curve.\n"); String::Concat(s, "Can you wait to find it \n"); String::Concat(s, "Do you have the nerve "); sw->WriteLine(s); sw->WriteLine("A drop of oil, jambo, jambo."); sw->WriteLine("Whisper in her ear,"); sw->WriteLine("Ask the question in your heart"); sw->WriteLine("that only you can hear"); sw->WriteLine(); StringBuilder^ sb = gcnew StringBuilder(); sb->Append("Fingers now upon your ears,\n"); sb->Append("Waiting for the space\n"); sb->Append("An answer if you're ready now\n"); sb->Append("From the marketplace\n"); sw->WriteLine(sb); sw->WriteLine("The call of a bird, jambo, jambo."); sw->WriteLine("The scent of a market flower,"); sw->WriteLine("Open wide to all of it and"); sw->WriteLine("Welcome back your power"); sw->WriteLine(); sw->WriteLine("Jambo this and jambo that,"); sw->WriteLine("Walking with bare feet."); sw->WriteLine("No parking allowed when down under,"); sw->WriteLine("Keep it to the street."); sw->WriteLine(); sw->WriteLine("Dead people rising,"); sw->WriteLine("Walking with bare feet,"); sw->WriteLine("No parking allowed when down under,"); sw->WriteLine("Keep it to the street."); // The resulting string might be displayed to the user in a GUI. MessageBox::Show(sw->ToString(), "Poetry", MessageBoxButtons::OK); }
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The Path field is the target of the link, synonymous with the href attribute of an anchor element. It can be either an absolute URL to some resource on the Web or a Drupal path (see 2 for a description of the different types of paths). You could, for example, create a content node such as a book page named Terms of Service. You would then be able to make a menu item called Terms of Service. In this case, the value in the Path field would look something like node/7.
Figure 16-13. Application running out of the browser
Another method for protecting Perl scripts is to restrict the script from using any data coming from outside the script. This can include visitor input and environment variables. Alterations to script data are thought of as tainted data. One way to instruct Perl to restrict the use of tainted data is to use the T switch at the end of the first line of your script. This will cause Perl to issue warnings when you try to do something potentially dangerous. You can still use tainted data, but you must first sanitize it. The safest way to do this is to check your input against a list of valid characters and strip away anything else. If you wrote your script using the library, something like the following will sanitize incoming data:
The namespace whose APIs do the push notification heavy lifting is Microsoft.Phone.Notification, and the HttpChannelNotification is its workhorse. Before a notification of any type can be sent, a notification channel must be created. The HttpChannelNotification class allows developers to create a new channel or find an existing (previously created) one using its Open and Find methods correspondingly. When programming push notifications, it is a good practice to check whether the channel has been previously created using the Find operation. You will see how this is done shortly in several upcoming walkthroughs. An important note about the Open method: once the channel is open, it is not immediately active. The push notification channel becomes active once it acquires the push notification URI from the MPNS. This URI is acquired in an asynchronous manner, as you will also see in the walkthroughs for this chapter. Other important methods of the HttpChannelNotification class include BindToShellToast and BindToShellTile. These methods are responsible for associating, or binding, a particular HttpChannelNotification channel instance to toast and tile notifications. These methods have corresponding UnbindToShellToast and UnbindToShellTile methods that disassociate toast and tiles subscriptions correspondingly from a given channel. Finally, the Close method of the HttpChannelNotification class closes the channel and removes all the subscriptions associated with that channel. Push notifications are most appropriate in situations where Windows Phone 7 applications almost fully depend on the data supplied by the server on the web or somewhere else in the cloud. As such, to demonstrate push notifications in action, you must create two separate projects: one project will be a Windows Phone 7 application, and the other project could be either a web-based application, a web service, or, for the purposes of keeping the current example simple, a Windows Forms application. To create a Windows Forms application that will be used as part of the next walkthrough, you will be using a version of Visual Studio that allows the creation of Windows Forms applications Visual C# 2010 Express. Alternately, you could use other (paid) editions of Visual Studio 2010 to create Windows Forms applications.
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