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will not be saved. This is actually a good thing because it can mean that unnecessary trips to the database aren t occurring. For value data types such as numbers, enums, Booleans, or immutable data such as strings, it is easy to check if their values change because you can simply compare the value of the data with an earlier value. However, with reference data types such as an Array, ArrayList, Dictionary, or custom data objects, it is not so simple to determine when data changes occur. This is because the value of complex reference types can change without their reference changing, and the framework therefore cannot tell that a change has occurred. 6.5.1 SetPersonalizationDirty In all the web parts we ve created so far, we ve seen that marking web part properties with the Personalizable attribute property ensures that values are automatically persisted and re-loaded for us by personalization. This is fine for properties based on value data types and immutable data types, because the portal framework knows how to track changes made to data. It is not sufficient, however, when we have web parts which have reference data types as properties. As a result, objects such as complex business objects or collections cannot be persisted by simply marking those properties with the Personalizable attribute. To assist us with the task of saving complex data, each web part has a method named SetPersonalizationDirty that we can use to inform the portal framework that a web part has changes and must have its data saved. To do this we simply call the SetPersonalizationDirty method on the WebPart to notify the portal framework when a change occurs. Consider the following web part used for managing information about employees. It has a complex property for storing the employee data.

PowerShell is usually exposed as a command shell and scripting language. It s .NET based and can access the .NET framework.

// (011) Toppings saucy = Toppings.ChocolateSauce | Toppings.ToffeeSauce;

function thwart(e) { if (e.preventDefault) { thwart = function(e) { e.preventDefault(); }; } else { thwart = function(e) { e.returnValue = false; }; } thwart(e); } The first time thwart() runs, it does a lot of work. But thereafter, thwart() runs snappily since its block contains but one statement. In Internet Explorer 9, Firefox, Safari, Chrome, and Opera, that would be e.preventDefault(), and in Internet Explorer or earlier that would be e.returnValue = false.

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This is the first time we ve created our own properties, so it is worth a short discussion. A property in C# is created much like a method. You define an access level, a type, and a name for the property. By convention, property and method names begin with a capital letter. The lack of parentheses after the name informs the compiler that this is a property and not a method. Inside the braces, the access methods for the property are defined. The access methods provide read access, via the get keyword, or write access, via the set keyword. The get access method must return the defined type, while the set access method uses the reserved word value to access the value provided on the right side of the equals sign = . For example, if we wanted users of our Photograph class to set the FileName property, we could code this as follows:

<select id="SelectEmployee" parameterClass="int" resultClass="Employee"> select EmployeeID as ID, FirstName, LastName from Employees where EmployeeID = #value# </select>

int[,] rectangularArray = {

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By design, the Generic Connection Framework distinguishes different protocol implementations by package name rather than class name. This is necessary since every protocol implementation is written in a class named Protocol.java. Keeping the class name the same relieves the Connector class from having to know the names of each implemented class. The classes are differentiated by the location in which they reside. For example, a socket protocol could be defined by the class com.sun.cldc. io.j2me.socket.Protocol.class and an http protocol could be defined by the class com.sun.cldc.io.j2me.http.Protocol.class. Even though the names of the classes are identical, the full qualification (package name and class name) of the class allows the two implementations to be distinguished from one another. In this example, the root package is com.sun.cldc.io and the platform is j2me . In the case of the CLDC reference implementation, the fully qualified class name for a protocol is constructed as follows using the root package name + platform + protocol name + Protocol, or more specifically com.sun.cldc.io.[j2se, j2me, palm].[socket, datagram, http].Protocol. The following example illustrates the process for creating a datagram protocol instance:

Called just before this page is swapped out for another page. The event args allow for canceling the navigation. You can use this to prompt the user to save data, for example. Equivalent to the Navigating event of the NavigationService class.

public IEnumerable<ScriptDescriptor> GetScriptDescriptors() { List<ScriptBehaviorDescriptor> descriptors = new List<ScriptBehaviorDescriptor>(); foreach (DataListItem item in listBooks.Items) { if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem) { Image imgBook = item.FindControl("imgBook") as Image; Button btnAddToCart = item.FindControl("btnAddToCart") as Button;

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