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This made it clear when the execution entered and left the event handler. You also saw that the sender object is the connection. When the connection is opened, its current state is Open and its original state is Closed. When the connection is closed, the current state is Closed and the original state is Open. This example runs pretty well, and you can see what s happening, but in a real-life application why would users care to be notified if a connection is open or closed All they

This makes it easier to read through the output from the transformation. Figure 7-9 shows the same file in IE 6, with indenting turned on (on the left) and off (on the right). The example on the left is much easier for a human to read.

need is to see the data. One way to use the StateChange event is to keep track of how many times connections are established and keep a running total. Based on this, you can charge users a fee per connection. (Of course, this is a rudimentary way of charging a fee, and you ll have to figure in other factors.) Another way to use this event would be to keep track of how much time a user has had a connection open and charge based on this.

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The InfoMessage event is raised by a connection when the database gives out information messages. Information messages aren t error messages from the database. They re warning and informational messages issued by the database. In the case of SQL Server, any message with a severity of ten or less is considered informational and would be captured with the InfoMessage event. The InfoMessage event handler receives an InfoMessageEventArgs object that contains a collection of the messages from the data source in its Errors collection property. The Error objects in this collection are of type SqlError, and can be queried for information such as the number, the source, the message, and the exact line number in the stored procedure where this message originated from, among other things. Let s run a query and a T-SQL PRINT statement. You ll capture this event and query the information in the Errors collection.

Figure 7-9. The planets14.xml page displayed in IE When applying XSLT stylesheets in a web browser, indenting output can cause problems for generated JavaScript. In this case, make sure you set the value of the indent attribute to no: <xsl:output indent="no"/> This benefits server-side XSLT as well. Because you include less white space, the generated files are smaller. As you saw in the previous example, you can deal with white space in the source document using the normalize-space() function. This function removes leading and trailing spaces, and it compresses internal white space to a single space character. You saw this within the following line: <xsl:value-of select="normalize-space(description/text())"/> You can also use the top-level <xsl:strip-space> element to strip out white-space-only nodes from elements in the source document. You can apply this to all elements with this line: <xsl:strip-space elements="*" /> Be aware that <xsl:strip-space> acts on nodes that only contain white space, not nodes that include text as well as white space. The opposite is the <xsl:preserve-space> element, which allows you to preserve white space within a document. As you saw in the previous example, dealing with white space in a stylesheet requires an understanding of what happens when an XSLT processor generates output. The processor removes all text nodes containing only white space, unless they re within an <xsl:text> element.

These should be reflected in the four LunchCounter database tables. Note that there are three many-to-one relationships in these orders: two condiments in Orders 1 and 2, and two stuffs in Order 4. The tables should reflect these. Figure 3-45 shows the four instances of SandwichOrder in the SandwichOrders table. This table contains the order keys only, since all the remaining data of an order (the Bread, Stuffs, and Condiments values) are reflected in the three other tables. If Lola and Norm get into further design iterations and refinements, the SandwichOrders table might contain other data, such as an Order timestamp. But for now, each instance in the table has only a key, reflected as a foreign key in each of the Breads, Condiments, and Stuffs tables.

To write the Connection.InfoMessage event: 1. Insert the code in Listing 15-3 into the click event handler for the second button.

Listing 15-3. Button2_Click()

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