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The first thing we re doing in our original code is setting up the worksheet by activating it and then clearing a contiguous region in preparation for importing our data: Set xlSheet = Sheets("Sheet2") xlSheet.Activate Range("A1").Activate Selection.CurrentRegion.Select Selection.ClearContents Range("A1").Select Then we re instantiating and opening a connection to our data: Set cnn = New ADODB.Connection sConnString = "Provider=SQLNCLI;Server=MYSERVERNAME\SQLEXPRESS;" & "Database=AdventureWorks;Trusted_Connection=yes;" cnn.Open sConnString Next, we get our data into an ADO recordset and place it on our worksheet: sSQL = "SELECT HumanResources.Employee.EmployeeID, Person.Contact.FirstName," & " Person.Contact.LastName FROM Person.Contact" & " INNER JOIN HumanResources.Employee" & " ON Person.Contact.ContactID = HumanResources.Employee.ContactID" & " WHERE (((HumanResources.Employee.EmployeeID) In" & " (SELECT HumanResources.Employee.ManagerID" & " FROM HumanResources.Employee)));" Set rs = New ADODB.Recordset rs.Open sSQL, cnn, adOpenDynamic Sheets("Sheet2").Activate Range("A1").CopyFromRecordset rs And finally, we do a quick bit of formatting the sheet by using the AutoFit command to resize the data columns: xlSheet.Select Range("A1").Select Selection.CurrentRegion.Select Selection.Columns.AutoFit Range("A1").Select These are four simple units of functionality that we can provide in a very generic and reusable object-oriented solution. In the VBE, add a new class module and name it cData. Add a second new class module and name it cExcelSetup. These will contain the code that will provide all of the functionality provided in our standard code module.

binFormat.Serialize(fStream, jbc); fStream.Close(); Console.ReadLine(); } As you can see, the BinaryFormatter.Serialize() method is the member responsible for composing the object graph and moving the byte sequence to some Stream-derived type. In this case, the stream happens to be a physical file. However, you could also serialize your object types to any Stream-derived type such as a memory location, given that MemoryStream is a descendent of the Stream type.

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Now suppose you want to read the persisted JamesBondCar from the binary file back into an object variable. Once you have programmatically opened CarData.dat (via the File.OpenRead() method), simply call the Deserialize() method of the BinaryFormatter. Be aware that Deserialize() returns a generic System.Object type, so you need to impose an explicit cast, as shown here: static void Main(string[] args) { ... // Read the JamesBondCar from the binary file. fStream = File.OpenRead("CarData.dat"); JamesBondCar carFromDisk = (JamesBondCar)binFormat.Deserialize(fStream); Console.WriteLine("Can this car fly : {0}", carFromDisk.canFly); fStream.Close(); Console.ReadLine(); } Notice that when you call Deserialize(), you pass the Stream-derived type that represents the location of the persisted object graph (again, a file stream in this case). Now if that is not painfully simple, I m not sure what is. In a nutshell, mark each class you wish to persist to a stream with the [Serializable] attribute. After this point, use the BinaryFormatter type to move your object graph to and from a binary stream. At this point, you can view the binary image that represents this instance of the JamesBondCar (see Figure 17-2).

Your next choice of formatter is the SoapFormatter type. The SoapFormatter will persist an object graph into a SOAP message, which makes this formatter a solid choice when you wish to distribute objects remotely using the HTTP protocol. If you are unfamiliar with the SOAP specification, don t sweat the details right now. In a nutshell, SOAP defines a standard process in which methods may be invoked in a platform- and OS-neutral manner (we ll examine SOAP in a bit more detail in the final chapter of this book during a discussion of XML web services). Assuming you have set a reference to the System.Runtime.Serialization.Formatters.Soap.dll assembly, you could persist and retrieve a JamesBondCar as a SOAP message simply by replacing each occurrence of BinaryFormatter with SoapFormatter. Consider the following code, which serializes an object to a local file named CarData.soap: using System.Runtime.Serialization.Formatters.Soap; ... static void Main(string[] args) { ... // Save object to a file named CarData.soap in SOAP format. SoapFormatter soapFormat = new SoapFormatter(); fStream = new FileStream("CarData.soap", FileMode.Create, FileAccess.Write, FileShare.None); soapFormat.Serialize(fStream, jbc); fStream.Close(); Console.ReadLine(); } As before, simply use Serialize() and Deserialize() to move the object graph in and out of the stream. If you open the resulting *.soap file, you can locate the XML elements that mark the stateful values of the current JamesBondCar as well as the relationship between the objects in the graph via the #ref tokens. Consider the following end result (XML namespaces snipped for brevity): <SOAP-ENV:Envelope xmlns:xsi="..."> <SOAP-ENV:Body> <a1:JamesBondCar id="ref-1" xmlns:a1="..."> <canFly>true</canFly> <canSubmerge>false</canSubmerge> <theRadio href="#ref-3"/> <isHatchBack>false</isHatchBack> </a1:JamesBondCar> <a1:Radio id="ref-3" xmlns:a1="..."> <hasTweeters>true</hasTweeters> <hasSubWoofers>false</hasSubWoofers> <stationPresets href="#ref-4"/> </a1:Radio> <SOAP-ENC:Array id="ref-4" SOAP-ENC:arrayType="xsd:double[3]"> <item>89.3</item> <item>105.1</item> <item>97.1</item> </SOAP-ENC:Array> </SOAP-ENV:Body> </SOAP-ENV:Envelope>

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