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protected void ZedGraphWeb1_RenderGraph( System.Drawing.Graphics g, ZedGraph.MasterPane mPane) { int nDays = 0; int nRows = 0; GraphPane pane = mPane[0]; PointPairList pt = new PointPairList(); double nx; double ny; string days = (string)Page.Request.Params["days"]; string ticker = (string)Page.Request.Params["ticker"]; if (ticker != null) { ticker = ticker.Trim(); DataTier theDataTier = new DataTier(); if (days == null) nDays = 0; else nDays = Convert.ToInt32(days); DataTable dtTable = theDataTier.GetFullPriceHistory(ticker,nDays); nRows = dtTable.Rows.Count;

are accessible over a direct port, without requiring a virtual directory. Here is an example of an HTTP endpoint:

And here is an example of the equivalent TCP endpoint:

for (int i = 1; i < nRows; i++) { ny = Convert.ToDouble(dtTable.Rows[i].ItemArray[1]); XDate tmpDate = new XDate( Convert.ToDateTime(dtTable.Rows[i].ItemArray[0])); nx = (double)tmpDate; pt.Add(nx, ny); } pane.XAxis.Type = AxisType.Date; pane.XAxis.GridDashOff = 0; LineItem priceCurve = pane.AddCurve( "Closing Price", pt, Color.SlateBlue,

Figure 9-1 illustrates the high-level schematic architecture for a typical message-based, service-oriented application that you might build using WCF.

The HTTP and TCP protocols have one thing in common, which is that they both enable messaging between remote components that are running on separate processes and on separate domains. TCP is a lower-level protocol that operates on a port rather than a virtual directory, which is a higher-level abstraction of a port. HTTP is designed for Request/Response messaging patterns, meaning that a request generates a direct response. TCP is designed for decoupled messaging patterns whereby a sender and a receiver communicate, but not necessarily as a two-way conversation. TCP enables asynchronous messaging, whereby the sender releases its calling thread as soon as the message has been delivered to the receiver. By extension, TCP also enables one-way messaging, because once a sender mails out a message, its resources are released, and the sender suffers no resource or scalability problems waiting for a response that will never come. This is the beauty of the decoupled TCP protocol: You can implement a Request/ Response messaging pattern if you want to, but unlike with HTTP, you do not have to.

SymbolType.None); priceCurve.Line.Width = 2.0F; pane.AxisFill = new Fill(Color.White, Color.AntiqueWhite); pane.XAxis.MinGrace = 0; pane.XAxis.MaxGrace = 0; pane.YAxis.MinGrace = 0; pane.YAxis.MaxGrace = 0; pane.AxisChange(g); } }

NOTE Technically, the HTTP protocol does support one-way messaging. The response will generate an HTTP 202 status code, and no SOAP message will be returned.

Figure 9-1. High-level schematic architecture for a WCF application The application architecture uses arrows to describe the path that a message takes between service endpoints. Although they are not shown in the diagram, the service endpoints are located where the arrow head contacts the client or service. Another interesting aspect of this diagram is the chained path that the messages take. WCF supports this level of

This event handler takes two parameters. The first is the base System.Drawing. Graphics object. To render the graph, right at the bottom of the event handler, the System.Drawing.Graphics object is passed to the AxisChange method of a ZedGraph pane to refresh and redraw the graph. The second parameter is a reference to the ZedGraph master pane, which is the collection of drawing surfaces that the ZedGraph exposes. Check out the ZedGraph documentation for information about how to use the panes to create different drawing surfaces. This graph is a simple line chart that uses only one pane, which is the one at the zero index of this collection. You refer to the pane with this line:

The Microsoft.Web.Services2 namespace provides a class called SoapEnvelope, which you use for generating SOAP messages in code. The SoapEnvelope class derives from the System.Xml.XmlDocument class, not surprisingly, and so it supports XML document loading, so that you can load preformatted SOAP messages into a SoapEnvelope object. Alternatively, you can construct the SOAP message from scratch by setting properties on the SoapEnvelope object.

Table 9-3 highlights important members of the SoapEnvelope class. Listing 9-4 shows you how to construct a SOAP message in code for requesting a stock quote from the RequestQuote operation.

GraphPane pane = mPane[0];

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

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