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If the Web service understands the SOAP header, it should set the DidUnderstand property to true. If the DidUnderstand property is false, then ASP.NET throws an excep tion of the type SoapHeaderException. By default, ASP.NET assumes that the SOAP header was processed successfully, so unless you set this property to false, the excep tion will never be thrown. To set the DidUnderstand property to true, you first need to add a SoapUnknownHeader variable to your Web service. The SoapUnknownHeader class can represent any data received from the client that is not understood. To use this class, you first need to cre ate a new variable, such as in the following code, and place it at the top of the class:

To optimize queries, one of the first basic strategies is to minimize the number of join clauses used. Another consideration is that outer joins incur more cost than inner joins because of the extra work needed to find the unmatched rows. If only inner joins are used in a query, the behavior of the ON and WHERE clauses is the same; it does not matter if you put an expression in the ON or WHERE clause. Compare the following two queries, with the differences shown in bold type; they both return the same results and use identical execution plans:

'VB Public unknownHeader() As SoapUnknownHeader //C# public SoapUnknownHeader unknownHeader;

customersDataGridView.CurrentCell.RowIndex.ToString();

The next step is to add code to your Web method to receive any unknown headers. If you were to apply the unknownHeader to the GetPurchasingTotal Web method created earlier, the new Web method declaration might appear as follows:

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-- Query 1 SELECT p.ProductID, p.Name, sod.SalesOrderID FROM Production.Product AS p INNER JOIN Sales.SalesOrderDetail AS sod ON sod.ProductID = p.ProductID WHERE p.Color = 'Black';

'VB <WebMethod(Description:="Retrieve Summed Purchase information for " + _ "a specific vendor within a certain time range. Also the Shipment Method " + _ "will be considered an optional parameter passed through the SOAP header"), _ SoapHeader("ShipMethod", Direction:=SoapHeaderDirection.InOut), _ SoapHeader("unknownHeader")> _ Public Function GetPurchasingTotal(ByVal VendorID As Integer, ByVal StartDate As DateTime, _

ByVal EndDate As DateTime) As String //C# [WebMethod(Description = "Retrieve Summed Purchase information for " + "a specific vendor within a certain time range. Also the Shipment Method " + "will be considered an optional parameter passed through the SOAP header"), SoapHeader("ShipMethod", Direction = SoapHeaderDirection.InOut), SoapHeader("unknownHeader")] public string GetPurchaseTotal(int vendorID, DateTime startDate,

label1.Text = CurrentCellInfo;

-- Query 2 SELECT p.ProductID, p.Name, sod.SalesOrderID FROM Production.Product AS p INNER JOIN Sales.SalesOrderDetail AS sod ON sod.ProductID = p.ProductID AND p.Color = 'Black';

DateTime endDate)

The final step in processing an unknown SOAP header is to add code within the Web method that sets the DidUnderstand property to false if an unknown header is encoun tered. The code to do this would appear as follows:

If these queries had been written with an outer join, they would not be syntactically equal and could have substantially different performance.

15. Create an event handler for the CustomersDataGridView.CellValidating event. (Select CustomersDataGridView on the form, click the Events button in the Prop erties window, and double-click the CellValidating event.) 16. Add the following code to the CellValidating event handler:

Next header //C# SoapUnknownHeader header;

As explained in 4, Using Additional Query Techniques, an uncorrelated subquery is executed only once per query execution and returns only one value. These queries typically incur very little overhead. Note that this type of subquery cannot have any reference (correlation) to the outer query. The following example uses a subquery to return all products that are cheaper than the average product price. The subquery calculating the average product price is executed first (only once), and then the value returned by the subquery is used as a parameter in the outer query:

foreach (header in unknownHeader)

' VB If CustomersDataGridView.Columns(e.ColumnIndex).DataPropertyName = "ContactName" Then If e.FormattedValue.ToString = "" Then CustomersDataGridView.Rows(e.RowIndex).ErrorText = _ "ContactName is a required field" e.Cancel = True Else CustomersDataGridView.Rows(e.RowIndex).ErrorText = "" End If End If // C# if (customersDataGridView.Columns[e.ColumnIndex].DataPropertyName == "ContactName") {

header.DidUnderstand = false;

USE AdventureWorks;

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