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The third query filter (filtering of the results of aggregate functions) is applied. Columns that should be returned by the query are selected. Results are sorted. The fourth (and last) query filter is applied; this causes the query to return only the first X rows from the results thus far. The tabular result returned by the SELECT statement is converted to Extensible Markup Language (XML).

After this lesson, you will be able to:

LocationColumn.Name = "LocationColumn"

Queries that use the UNION clause use the theoretical execution order shown in Table 6-2.

Understand what basic elements are included in a SOAP header. Know how to add a custom SOAP header class. Build a client that processes the SOAP header. Know how to handle unknown SOAP headers.

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Headers are one of the three elements that a SOAP message can contain. According to both the SOAP 1.1 and 1.2 specifications, the Header element is optional. You might recall from Lesson 1 that a SOAP message can contain up to three elements: the Enve lope (or the root element), the Header (the only optional element), and a Body (which contains the bulk of the message). When the Header is included, it should be placed directly below the Envelope element. Typically, the Header element should contain metadata, which describes what will be contained in the body of the message. The element can also specify how the SOAP request should be processed. In many cases the element contains information about authentication and transactions. According to the SOAP specification, there are three attributes that can be used in a Header element. They are as follows:

1. 2. 3.

LocationColumn.HeaderText = "Location"

Specifies how data should be encoded. This attribute is applica ble when the header is used to handle authentication requests.

Specifies the actual node that will process the header block. For the SOAP 1.2 specification, this attribute was renamed to role. Binary value that specifies whether the block conforms to cer tain specifications.

FROM, JOIN, APPLY, and ON WHERE GROUP BY and aggregate functions (such as SUM, AVG, etc.) that are included in the query HAVING TOP

LocationColumn.DataPropertyName = "Location"

The Header element can contain multiple header blocks, but each header block must have its own unique namespace. The following is an example of what a single SOAP header block might look like for a Web method named GetPurchaseTotal.

The join is executed and the first query filter (the ON clause) is applied. The second query filter is applied. Grouping and aggregation calculations are performed. The third query filter (filtering of the results of aggregate functions) is applied. The fourth (and last) query filter is applied; this causes the query to return only the first X rows from the results thus far. (Note that in this case, the TOP clause is executed before the ORDER BY clause.) The results of each SELECT statement included in the query are concatenated; columns that should be returned by the query are selected. The results are sorted. The tabular result returned by the SELECT with UNION statement is converted to XML.

< xml version="1.0" encoding="utf-8" > <soap12:Envelope xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance"

To assign a SOAP header to a public Web method you need to create a class that inher its from the System.Web.Services.Protocols.SoapHeader class. For example, if you want to add a header to the preceding GetPurchaseTotal Web method, you would first create a class similar to the following:

CustomersDataGridView.Columns.Add(LocationColumn)

4. 5.

//C# public class VendorHeader : System.Web.Services.Protocols.SoapHeader {

public ShipMethods ShipMethod;

7. 8.

End Sub // C# private void Form1_Load(object sender, EventArgs e) { // TODO: This line of code loads data into the 'northwindDataSet.Customers' table. You can move, or remove it, as needed.

public enum ShipMethods {

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