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Marshaling Objects by Value Marshaling by value downloads the entire object's contents to the client, which uses the instance data to initialize a client-side object of that type. The client obtains a perfect local clone of the original object and can work with it completely oblivious to the fact that the object data has been downloaded from a remote location. In general, MBV is not recommended when you have to cope with large objects with several properties. With MBV, you take the risk of consuming a significant portion of bandwidth to perform the full object's data download, thus subjecting the client to a potentially long wait to execute only one or two methods. MBV also imposes some constraints on the remotable objects. In particular, any objects that need to be consumed by value must qualify as serializable which is not the case for all objects. In addition to objects that deliberately make themselves nonserializable, some objects are objectively hard to serialize. In this list, you certainly find classes that represent or contain database connections. More generally, the list includes all those objects that can't be reasonably represented outside their native environment. This happens when all or part of the information stored in an object does not make sense once the object is transferred to the client. If the object has any implicit dependencies on server-side resources, you can't just use it from the client. For example, if the class has a method that accesses a SQL Server table, you could call it from the client only if the same SQL Server table is accessible from the current location. 428

When to Marshal by Value So how do you know when MBV is a good option Let's say that MBV is a compelling option when the following conditions are true: The object is not particularly large and complex. You're going to make intensive use of the object. You have no special security concerns. The object has no dependencies on remote resources such as files, databases, devices, or system resources. Some rather illustrious .NET Framework classes that support remoting through the MBV technique are the DataSet and DataTable classes. MBV Objects The .NET Remoting system serializes all the internal data of MBV objects and passes the stream to the calling AppDomain, as illustrated in Figure 12-2.

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If you want greater control over the position of a block of text in your document, consider using text boxes. You can place these boxes anywhere in the document and format them with shading and borders. Additionally, you can link text boxes so that the contents flow between the boxes automatically. This is convenient if you want to insert a story that begins on one page of a newsletter and continues on a different page. To insert a text box, click Insert Text Box. Click and drag your mouse where you would like to position the box in your document. It will appear with a border that you can use to resize or reposition the text box, as Figure 3-25 demonstrates.

Excel s List command is great to use for a lot of your list needs. However, you cannot use Excel lists with the following items: Shared workbooks: You must unshare the workbook before you can convert a range to a list, or convert the list to a normal range to share a workbook that contains a list. Compare and merge workbooks: You must convert the list to a normal range before you can compare and merge workbooks.

Figure 12-2: How .NET Remoting marshals objects by value. After the data is in the client AppDomain, a new local object is instantiated and initialized and starts handling calls. To write remotable objects that are exchanged by value, you need to make them serializable, either by declaring the SerializableAttribute attribute or by implementing ISerializable. Aside from this, nothing else is required for instances of the class to be passed by value across AppDomains. Marshaling Objects by Reference When an object is marshaled by reference, the client process receives a reference to the server-side object, rather than a copy. This means that any call directed to the object is always resolved on the server within the native context of the object. The remoting infrastructure governs the call, collecting all information about the call and sending it to the server process. On the server, the correct object is located and asked to execute the call using the client's arguments. When the call is finished, the results are packaged and sent back to the client. Unlike MBV, MBR uses the network only for transmitting arguments and return values. Figure 12-3 shows the architecture of MBR remoting. 429

Figure 12-3: How NET Remoting marshals objects by reference The NET Remoting implementation of MBR provides for a proxy/stub pair and a physical channel for network transportation The proxy represents the remote object to the client, as it simply mirrors the same set of methods and properties Each client invocation of a remote method actually hits the local proxy, which, in turn, takes care of routing the call down to the server A method invocation originates a message that travels on top of a channel and a transmission protocol Each message passes through a chain of hook objects (called sinks) on each side of the transport channel Sinks are nearly identical to Windows hooks By defining and registering a sink, the programmer can perform a specific operation at a specific stage of the remoting process.

Subtotals: Excel lists automatically display subtotals using the Totals row (the Toggle Totals Row button on the list toolbar). However, you cannot have Excel automatically insert subtotal rows after categories of data. If you need a subtotals report, convert the list to a normal range. Custom views: You must convert the list to a normal range to create custom views of the worksheet, as covered in the following section.

Because the creation of the proxy takes place automatically, the programmer has little to do other than creating an instance of the target object and issuing the call If the object resides in an external AppDomain, the remoting infrastructure creates a local proxy for it to perform the requested operation But how can the code determine whether a given object is local, lives in a remote AppDomain, or just doesn't exist In spite of the sophisticated code that constitutes the remoting infrastructure, programming remote objects is mostly a matter of setup Once the client has been properly configured, you normally create a new instance of the remote class using the new operator, no matter what type of class you're calling and where it resides Clients must declare to the CLR which classes are remote and provide connection information.

Note By default, Word places text boxes in a drawing canvas. You may find this inconvenient. You can

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