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This lesson expands on Lesson 1 by going into what is involved in creating a publicly exposed Web method. After creating a public method, the lesson steps through the process of applying the WebMethod attribute. The Web method can then be config ured by setting one of several properties for the WebMethod attribute. The lesson con cludes by showing an example of a specialized Web method known as a one-way method.

Open a new query window, type, highlight, and execute the following code to create an unshipped order:

After this lesson, you will be able to:

NewRow.CustomerID = "WINGT";

In the existing query window, type, highlight, and execute the following code to create the function:

Create a public Web method and apply the WebMethod attribute. Configure a Web service method. Identify the code necessary to configure a Web service using the WebService attribute.

At the most basic level, you can make a method accessible through a Web service application by attaching the WebMethod attribute to a public method. The public method is stored in the class file of your Web service file (the one with the .asmx extension). When you create a Web service project using the Web service project tem plate, one public method named HelloWorld is created for you by default. You can see the code for the HelloWorld method by right-clicking the Service.asmx file in Solution Explorer and clicking View Code.

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CREATE FUNCTION Sales.GetUnshippedOrders() RETURNS TABLE AS RETURN SELECT a.SalesOrderID, a.CustomerID, a.OrderDate, a.DueDate, c.Name, b.OrderQty FROM Sales.SalesOrderHeader a INNER JOIN Sales.SalesOrderDetail b ON a.SalesOrderID = b.SalesOrderID INNER JOIN Production.Product c ON b.ProductID = c.ProductID WHERE a.ShipDate IS NULL GO

NewRow.CompanyName = "Wingtip Toys";

Your Web service class can contain other methods that are not public, but they will not be accessi ble as Web methods. Instead, they will only be available to the other methods in your Web service class.

The HelloWorld public method does not become available through the Web service until you attach the WebMethod attribute. This method must be applied to each method declaration that will be accessible. The following code shows how the WebMethod appears at the top of the HelloWorld method.

Test the function. Turn on the display of the actual execution plan to verify that SQL Server did not execute the function but instead substituted the function body into the SELECT statement. In the existing query window, type, highlight, and execute the following code:

1

NewRow.ContactName = "Steve Lasker";

Return "Hello World"

SELECT c.FirstName, c.MiddleName, c.LastName FROM Sales.GetUnshippedOrders() a INNER JOIN Sales.Customer b ON a.CustomerID = b.CustomerID INNER JOIN Person.Person c ON b.PersonID = c.BusinessEntityID GO

End Function //C# [WebMethod] public string HelloWorld() {

NorthwindDataset1.Customers.Rows.Add(NewRow);

In the existing query window, type, highlight, and execute the following code to reset the data to the original values:

return "Hello World";

Web methods can be configured using one of several different properties. These prop erties allow you to specify everything from the Web method description to how it will handle transactions. The different properties available with the WebMethod attribute are as follows:

In this exercise, you create and use a multi-statement table-valued function to return the most recent order for a customer.

Modify values in individual columns of a DataTable by selecting the DataRow you want to edit and assigning a new value to the desired column. For example, the following code changes the CompanyName column of the SelectedRow to the value assigned, in this case, Contoso :

This property provides a general description for what the Web method is supposed to accomplish. Although the default value for this property is an empty string, it is a good idea to always provide at least one sentence that briefly describes your Web method. Later you will see how the value specified for the description is displayed on the Service help page.

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