It is an exciting time to be a Windows developer. The arrival of Windows 8 is a complete game changer. The operating system and its development platform offer you an entirely new way to create rich, full-featured Windows-based applications. This team of authors takes you on a journey through all of the new development features of the Windows 8 platform specifically how to utilize Visual Studio 2012 and the XAML/C# languages to produce robust apps that are ready for deployment in the new Windows Store.

Professional Windows 8 Programming:

Learn how to utilize XAML to create rich content driven user interfaces
Make use of the new AppBar to create a chrome-less menu system
See how to support Sensors and Geo-location on Windows 8 devices
Integrate your app into the Windows 8 ecosystem with Contracts and Extensions
Walks you through the new Windows 8 navigation system for multi-page apps
Minimize code with Data Binding and MVVM design patterns
Features tips on getting your app ready for the Windows store
Maximize revenue for your app by learning about available monetization strategies

Error Occurred While Processing Request The web site you are accessing has experienced an unexpected error.
Please contact the website administrator.

The following information is meant for the website developer for debugging purposes.

Error Occurred While Processing Request

The value '' cannot be converted to a number.

The error occurred in D:/wwwroot/traintestcert/estore/training_product.cfm: line 222

220 : 	<cfprocparam  type="In"  cfsqltype="CF_SQL_CHAR" value="A">	
221 : </cfstoredproc>
222 : <cfset cart_total = buytotalamount + GetECommerceMatrix.selling_price>
223 : <cfoutput>
224 : <script type="text/javascript">

Resources:

Check the ColdFusion documentation to verify that you are using the correct syntax.
Search the Knowledge Base to find a solution to your problem.

Browser	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Remote Address	10.0.120.66
Referrer	http://www.traintestcert.com/estore/training_product.cfm/PUBS/WILEY/9781118205709/564502890/128.html
Date/Time	19-Apr-24 08:19 PM

Stack Trace

at cftraining_product2ecfm329136785.runPage(D:/wwwroot/traintestcert/estore/training_product.cfm:222)

coldfusion.runtime.Cast$NumberConversionException: The value '' cannot be converted to a number.
	at coldfusion.runtime.Cast._double(Cast.java:825)
	at coldfusion.runtime.Cast._double(Cast.java:803)
	at coldfusion.runtime.Cast._double(Cast.java:1110)
	at coldfusion.runtime.Cast._double(Cast.java:1100)
	at cftraining_product2ecfm329136785.runPage(D:\wwwroot\traintestcert\estore\training_product.cfm:222)
	at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:262)
	at coldfusion.tagext.lang.IncludeTag.handlePageInvoke(IncludeTag.java:735)
	at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:565)
	at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65)
	at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:595)
	at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:43)
	at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40)
	at coldfusion.filter.PathFilter.invoke(PathFilter.java:162)
	at coldfusion.filter.IpFilter.invoke(IpFilter.java:45)
	at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:96)
	at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:78)
	at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)
	at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)
	at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:60)
	at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)
	at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)
	at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62)
	at coldfusion.CfmServlet.service(CfmServlet.java:226)
	at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:311)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:46)
	at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:47)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:377)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:463)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:834)