Problem with XML Services

• • Reply

  19 years ago

  by Veritant

  John

  London, UK, United Kingdom

  Joined 19 years ago

  Hi, I hope someone out there can help me!
  

  
  I am trying to develop an XML web service, and a client application that uses the service, both using VB.Net.
  

  
  I am using the example given in the Visual Studio .Net documentation - a Temperature Conversion service.
  

  
  I have successfully built the service and can test it ok using the default test pages that IIS provides.
  

  
  I then build the client to use this service. I have not renamed the service, instead just using the "localHost" label that is given by default.
  

  
  Basic operation seems to be successful. In a browser on any machine in the network I get the page with the input box, button and label as instructed. I have added some extra code to the button1click function as below:
  

  Code:

  
  Private Sub Button1Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
         Dim ws As New localhost.Service1()
         Dim dFahrenheit As Double
         Dim dCelsius As Double
         If TextBox1.Text.Length > 0 Then
             On Error GoTo ConvertError
             dFahrenheit = Convert.ToDouble(TextBox1.Text)
             dCelsius = ws.ConvertTemperature(dFahrenheit)
         Else
             dCelsius = 0
         End If
         Label1.Text = dCelsius.ToString()
         Exit Sub
  ConvertError:
         Label1.Text = Err.Description
     End Sub
  

  
  This code allows me to submit the form with no input (lenght of text1 is zero), and I get the value 0 returned in the label, as expected.
  

  
  BUT...
  

  
  When I enter a value in text1 and submit the form, the code runs as far as:
  

  Code:

  
             dCelsius = ws.ConvertTemperature(dFahrenheit)
  

  
  then it hangs. The whole of the IIS hangs for about 90 seconds. I cannot get any pages from the IIS at all, from any machine, it just goes dead. After the 90 secs or so is up, a timeout error is raised, and label1 contains the message "Operation timed out". IIS comes back to life.
  

  
  I have tried setting both the service1 and service1client entries in IIS to run as isolated processes, but this makes no difference. IIS still hangs for 90 secs then comes back to life.
  

  
  Does anyone know what I need to do to fix this problem?
  

  
  Thanks in advance!

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