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The following example implements the server-side functionality as an HTTP handler. The HTTP handler accepts information through the query string (in this case, it checks for two parameters) and then returns two pieces of information. The first piece of information is the sum of the two arguments that were passed in through the query string. The second piece of information is the current time on the web server. The information is not a legitimate XML document instead, the two values are simply separated by a comma. Here s the complete code for the HTTP handler: Imports Microsoft.VisualBasic Public Class CalculatorCallbackHandler Inherits IHttpHandler Public ReadOnly Property IsReusable() As Boolean Get Return True End Get End Property Public Sub ProcessRequest(ByVal context As HttpContext) Dim response As HttpResponse = context.Response ' Write ordinary text. response.ContentType = "text/plain" ' Get the query string arguments. Dim value2 As Single Dim value1 As Single If (Single.TryParse(context.Request.QueryString("value1"), value1) And Single.TryParse(context.Request.QueryString("value2"), value2)) Then ' Calculate the total. response.Write((value1 + value2)) response.Write(",") ' Return the current time. Dim now As DateTime = DateTime.Now response.Write(now.ToLongTimeString) Else ' The values weren't supplied or they weren't numbers. ' Indicate an error. response.Write("-") End If End Sub End Class

Note As you will see in 18, a key motivation for adding optional arguments to C# is to simplify interacting with COM objects. Several Microsoft object models (e.g., Microsoft Office) expose their functionality via COM objects, many of which were written long ago to make use of optional parameters.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Me.DataBind() End Sub Figure 9-1 shows what you ll see when you run this page.

To illustrate working with optional arguments, assume you have a method named EnterLogData(), which defines a single optional parameter: static void EnterLogData(string message, string owner = "Programmer") { Console.Beep();

You ll see data binding expressions again when you create templates for more advanced controls in 10.

public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); } }

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Console.WriteLine("Error: {0}", message); Console.WriteLine("Owner of Error: {0}", owner); } Here, the final string argument has been assigned the default value of "Programmer", via an assignment within the parameter definition. Given this, we can call EnterLogData() from within Main() in two manners: static void Main(string[] args) { Console.WriteLine("***** Fun with Methods *****"); ... EnterLogData("Oh no! Grid can't find data"); EnterLogData("Oh no! I can't find the payroll data", "CFO"); Console.ReadLine(); } Because the first invocation of EnterLogData() did not specify a second string argument, we would find that the programmer is the one responsible for losing data for the grid, while the CFO misplaced the payroll data (as specified by the second argument in the second method call). One very important thing to be aware of, is that the value assigned to an optional parameter must be known at compile time, and cannot be resolved at runtime (if you attempt to do so, you ll receive compile time errors!). To illustrate, assume you wish to update EnterLogData() with the following extra optional parameter: // Error! The default value for an optional arg must be known // at compile time! static void EnterLogData(string message, string owner = "Programmer", DateTime timeStamp = DateTime.Now) { Console.Beep(); Console.WriteLine("Error: {0}", message); Console.WriteLine("Owner of Error: {0}", owner); Console.WriteLine("Time of Error: {0}", timeStamp); } This will not compile, as the value of the Now property of the DateTime class is resolved at runtime, not compile time.

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