Rock, Paper, Azure! Contest – White Screen or 404 Error While Running Local.

I registered for ROCKPAPERAZURE, downloaded the Bits, after installing the pre-reqs, click F5 and got a 404/blank page.

After some troubleshooting I found that install the following applications through the Microsoft Web Platform Installer, the issue was corrected.  I also verified this with Kevin D. Wolfe - as he had the same issue – thanks Kevin:

  1. IIS 7 Recommended Configuration (Good to clean up IIS installs)
  2. Application Request Routing 2.5

Anyway happy Rock, Paper, Azure!, follow the link for more info or to compete.

Sequential Convoys

Quite a few people have asked “What are sequental convoys?” and “When should I use them?”.  So here is the definition and a quick example on when and/or how I would use them. 

 “A sequential convoy enables multiple single messages to join together to achieve a required result. A sequential convoy is a set of related messages that have a predefined order. Although the messages do not have to be exactly the same, BizTalk Server must receive them in a sequential order.” * Microsoft definition

 Where this becomes handy in business is around batching of messages, an example of this would be when a business process requires batch processing that needs to retain the order in which the message was received.  The way this is accomplished is to put a Listen shape within a delay, which the delay the loop ends.  During this delay time any number of received messages can enter the same business process.  This approach can have a side effect of Zombie messages, but we will look at those in a future post.

In our book, we discuss a pharmaceutical ESB system and we have a process that batches order messages from vendors until 2pm, then sends order processing and shipping.  In this process we show the use of sequential convoys as well as look into the side effects of this process.

Silverlight 4 Printing

Printing in Silverlight has been made pretty simple, how it comes with some caveats because it opnly supports rasterized image printing.  Not 100% a problem but in LOB applications will run into issue with printing thinks like PDF, because all formatting is lost in reflect to the final printed document.

Here is a quick code method on printing in Silverlight 4:

[sourcecode langauge="csharp"]
PrintDocument documentToPrint= new PrintDocument();
documentToPrint.DocumentName = "Sample Document";
documentToPrint.StartPrint += new EventHandler(documentToPrint_StartPrint);
documentToPrint.PrintPage += new EventHandler(documentToPrint_PrintPage);
documentToPrint.Print();
[/sourcecode]

Quick Refresher – ASP.NET Page Life Cycle

The Life Cycle of a page when requested for the first time:

Initializing: During this phase, the server creates an instance of the server control

Loading: During this phase, the instance of the control is loaded onto the page object in which it is defined.

PreRendering: During this phase, the control is updated with the changes made to it. This prepares the control for rendering.

Saving: During this phase, the state information of the control is saved. For example, if a value is set for the control during the Load event, it is embedded in the HTML tag that will be returned to the browser.

Rendering: During this phase, the server creates the corresponding HTML tag for the control.

Disposing: During this phase, all cleanup tasks, such as closing files and database connections opened by the control are performed.

Unloading: During this phase, all cleanup tasks, such as destroying the instances of server control are performed. This is the final event in the life cycle of a server control

The processing sequence in which a page is processed during a postback event is:

Initializing: During this phase, the server creates an instance of the server control

Loading view state: During this phase, the view state of the control posted by the client is reloaded into the new instance of the control.

Loading: During this phase, the instance of the control is loaded onto the page object in which it is defined.

Loading the postback data: During this phase, the server searches any data corresponding to the control that is loaded in the data posted by the client.

PreRendering: During this phase, the control is updated with the changes made to it. This prepares the control for rendering.

Saving state: During this phase, the change in the state of control between the current request and the previous request of the page is saved. For each change, the corresponding event is raised. For example, if the text of a textbox is changed, the new text is saved and a text_change event is raised.

Rendering: During this phase, the server creates the corresponding HTML tag for the control.

Disposing: During this phase, all cleanup tasks, such as closing files and database connections opened by the control are performed.

Unloading: During this phase, all cleanup tasks, such as destroying the instances of server control are performed. This is the final event in the life cycle of a server control

The events associated with the relevant page cycle phases are:

  • Page Initialization: Page_Init
  • View State Loading:LoadViewState
  • Postback data processing: LoadPostData
  • Page Loading: Page_Load
  • PostBack Change Notification: RaisePostDataChangedEvent
  • PostBack Event Handling: RaisePostBackEvent
  • Page Pre Rendering Phase: Page_PreRender
  • View State Saving: SaveViewState
  • Page Rendering: Page_Render
  • Page Unloading: Page_UnLoad