Developing Your First Silverlight Application Using Visual Studio 2008 - Consuming the ASP.NET Web Service from the Silverlight application using the Visual Studio 2008 solution

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Once the web service and Silverlight projects are developed and configured as shown in previous sections, we need to link the Silverlight application with the ASP.NET web service, consume the service and present the consumed information on the Silverlight Canvas.

Go through the following steps to achieve the same:

• Right click on the “SilverlightTest” project (in “Solution Explorer”) and click on “Add Web Reference.”

• In the “Add Web Reference” dialog, click on “Web Services on the Local Machine.”

• In the list of services, select “ProductService” by clicking on it (Fig 14).

• Provide "NorthwindService" as the “Web reference name” and click on the “Add Reference” button (Fig 15).

• In the code behind, modify the code so that it looks like the following:

Partial Public Class Page

Inherits Canvas

Public Sub Page_Loaded(ByVal o As Object, ByVal e As EventArgs)

' Required to initialize variables

InitializeComponent()

Dim svcNorthwind As New NorthwindService.ProductService

Dim objProject As NorthwindService.Product = svcNorthwind.GetProductInfo(2)

Dim txtProductName As New TextBlock

With txtProductName

.Text = "Total sale value of Product '" & objProject.ProductName & "' is " & objProject.SaleTillToDate

.Width = "437"

.Height = "25"

.SetValue(Canvas.LeftProperty, 8)

.SetValue(Canvas.TopProperty, 8)

End With

Me.Children.Add(txtProductName)

End Sub

End Class

Hit F5 to execute the application and point the URL to

http://localhost/SilverlightTest/TestPage.html

Pointing to the URL manually as above (in the browser) is essential as the request to the web service must be from the same web server as the Silverlight project. Otherwise, it may raise issues related to “cross domain access.”

Even though you are pointing manually to the localhost, the Silverlight project can still be debugged in the same traditional manner. The URL must be pointed to the browser window which came up when F5 is hit (otherwise, you will have to attach the process for debugging).

If everything went well, you should see the output as follows (Fig 16):

I hope you enjoyed the article and any suggestions, bugs, errors, enhancements etc. are highly appreciated at http://jagchat.spaces.live.com

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