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hroughout this book, you ve been exploring some of the underpinning technologies of ASP.NET AJAX, including the client-side JavaScript libraries, which are object-oriented additions to JavaScript. You ve also seen the power of ASP.NET AJAX server controls and the ease with which they can be used to add asynchronous update functionality to an ASP.NET page. In addition, we explored the rich set of UI controls and extenders offered as part of the ASP.NET AJAX Control Toolkit. Lastly, we reviewed the Virtual Earth SDK, and you saw how to add AJAX-style mapping functionality to your web applications. In this chapter, you ll go through, in detail, what it takes to build an application that makes the most of these features to deliver a real-world application. The application you will build is a very simple financial research tool that delivers stock quotes, extended stock information, and some price history analytics. This sort of information is typically used in technical analysis stock trading. Stock traders use a number of methodologies to determine a good buying or selling price of a stock, including fundamental analysis, where you look at company fundamentals such as dividends, profits, earnings per share, gross sales, and more usually a good methodology when investing in a company for medium- to long-term investments. Day traders, who are looking for a quick in and out, typically use technical analyses where they want to look at the momentum of the stock based on how it has performed in similar situations recently. The closing price for a stock over time is called the price history, and by applying various mathematical transforms to it, a day trader can guess where it is going to go. It s an inexact science, but when carefully applied, it can be effective. We will also use Bollinger band based analysis of price history and see how to deliver it in an ASP.NET AJAX application. You ll see how technical traders use this to determine potential times to get in and out of a stock. This should not be construed as investment advice; it is provided for informational use only and as a demonstration of the ASP.NET technology. You can see a snapshot of this application in Figure 10-1. using barcode generator for eclipse birt control to generate, create bar code image in eclipse birt applications. textbox BusinessRefinery.com/ barcodesuse .net framework crystal report bar code generator to produce bar code on visual basic creates BusinessRefinery.com/barcodeElapsed times include waiting on following events: Event waited on Times ---------------------------------------Waited db file sequential read 2 SQL*Net message to client 2 SQL*Net message from client 2 generate, create barcodes websites none on c# projects BusinessRefinery.com/ bar codehow to display text barcode java use birt barcodes implement to use barcodes for java various BusinessRefinery.com/ bar codeIn this chapter I introduced the concept of integrating applications using WCF and Windows Azure. WCF is a powerful tool for writing enterprise-class applications and makes loosely coupled applications easier to write and manage. Add to that the benefits of Windows Azure, and there are plenty of possibilities. A lot of the intricacies of WCF and Azure are beyond the scope of this book, so I simply showed you how to host a WCF service in the cloud. I demonstrated how other .NET applications (and even Java applications) will be able to take advantage of your cloud-based WCF services. sharepoint barcode attachement using default .net winforms to display barcodes with asp.net web,windows application BusinessRefinery.com/barcodegenerate, create barcodes size none with .net projects BusinessRefinery.com/ barcodesA method can return a value to the calling code. The returned value is inserted into the calling code at the position in the expression where the invocation occurred. To return a value, the method must declare a return type before the method name. If a method does not return a value, it must declare a return type of void. The following code shows two method declarations. The first returns a value of type int. The second does not return a value. Return type int GetHour() { ... } void DisplayHour() { ... } No value is returned. A method that declares a return type must return a value from the method by using the following form of the return statement, which includes an expression after the keyword return. Every path through the method must end with a return statement of this form. return Expression; Evaluates to a value of the return type // Return a value. to get qr-code and qr code jis x 0510 data, size, image with c sharp barcode sdk format BusinessRefinery.com/qr codesqr-code data connect in .net BusinessRefinery.com/Quick Response CodeFigure 3-19. Consumption of resources while data binding The first hit you take on the web server s memory is when you call Fill on the DataAdpater. This marshals your entire result set from the database into the process space of the web server. The DataSet carries not only the current values as read from the database, but also the original values as the data was read out of the database, as well as metadata about the structure of the DataTable objects contained in its TablesCollection. The DataSet is a very powerful object, but it s also a very fat object. You take a hit whenever you load one into memory. If you re doing this on your home page, you re taking this hit not once, but once for each user that comes to your site. But wait, it gets worse. The next thing you do is set the DataSource of the DataGrid and call DataBind. As we just went over, this creates an in-memory collection of DataGridItems. This collection is probably just as large as your DataSet. If you re only outputting a couple of columns, maybe it won t be as large. 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CHAPTER 3 s ATLAS: MAKING CLIENT-SIDE JAVASCRIPT EASIER
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