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This lab focuses on configuring a server application using a configuration file. The lab utilizes the server application created in Lab 1 of this chapter. The application is mod ified by adding a configuration file and loading that configuration file in the code. The configuration file is used to register a singleton remote object and register a TCP chan nel for this object. 1. Open Visual Studio 2005. 2. Click File, Open, Project. 3. In the Open Project dialog box, browse to the location where the MyRemoteOb ject.sln file was created in Lab 1 and load the solution. Right-click the MyServerApplication project in Solution Explorer and click Add and New Item. In the Add New Item dialog box, select Application Configuration File as the template and click Add to add the new file to your project. 4. Right-click the newly created App.config and click View Code. In the code win dow, replace all the code with the following:

<SqlFacet(Precision:=38, Scale:=5)> _ Public Property Value() As SqlDecimal <SqlMethod(IsPrecise:=True, IsDeterministic:=True)> _ Get If Me.m_IsNull Then Return SqlDecimal.Null End If Return Me.m_Value End Get

2. How do asynchronous methods differ from traditional ones (Select all that apply.) A. They have a different signature and return type in most cases. B. Other methods can be processed while the call to the Web method is processing. C. The Completed event must be handled to get the results back. D. The method call is for all intents and purposes identical to the synchronous counterpart.

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5. In the Designer, set the Form2.Localizable property to True and set the Language property to German (Germany). 6. Set the Text properties of Label2 and Label4 as follows: Label Label2 Label4 Text Property Value W hrung-Format

' Called by SQL Server to validate the currency value. Public Function Validate() As Boolean Return System.Text.RegularExpressions.Regex.IsMatch( _ Me.m_CurrencyCode, "^[A-Z]{3}$") End Function

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The previous lesson introduced both synchronous and asynchronous invocations of Web services. In this lesson, we delve a little deeper into the process of asynchronous invocations.

' Convert a string to a currency value. Public Shared Function Parse(ByVal input As SqlString) As CurrencyValueType If input.IsNull Then Return CurrencyValueType.Null End If

After this lesson, you will be able to:

7. In the Designer, choose the tab for Form1. 8. From the Toolbox, add three Button controls to the form and set their Text prop erties as shown here: Button Button1 Button2 Button3 Button Text Property Value United States United Kingdom Germany

Use a delegate to invoke a Web service. Use polling to check the state of completion and respond accordingly. Use built-in delegates.

Dim space As Integer = input.Value.IndexOf(" ") If space <> 3 Then Throw New InvalidOperationException( _ "The input string cannot be converted to a currency value.") End If

When a method is called asynchronously, you don t really know when it has finished. Typically, programs execute in a linear fashion, but that s not the case with asynchro nous calls. Consider the following situation:

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A program calls the GetTickerSymbol method of a Web service to look up a com pany s stock ticker symbol. The program next calls another method of the Web service, passing a second company s stock ticker symbol, to retrieve the company s closing stock price. When the first method returns, the program uses the results to call to retrieve the first company s closing stock price.

Dim currencyCode As String = input.Value.Substring(0, 3) Dim value As Decimal = SqlDecimal.Parse(input.Value.Substring( _ 4, input.Value.Length - 4)).Value

In a synchronous scenario, you can be sure that the second and third calls will not execute until the first call is completed. You can also be sure that the third call won t complete until the second call is completed. In an asynchronous scenario, you don t know when any of the calls are going to return and you certainly can t count on them finishing in the sequence in which they were called. (If the calls do finish in the sequence in which they were issued it s only due to random chance.)

9. In the Designer, double-click Button1 to open the Button1_Click default event handler and add the following code:

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