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Keep in mind that the DeriveParameters method requires a roundtrip to the SQL Server database to acquire the metadata needed to fill the Parameters collection. Because the signature of a stored procedure rarely changes after the application is deployed, it makes sense that you burn the names and the type of the parameters in code to speed up execution. Even if you don t count performance problems, filling the Parameters collection auto; matically isn t usually a good idea. For example, the preceding code snippet shows that the DeriveParameters method incorrectly detects a return value parameter, even when the stored procedure doesn t really have a return value. In some circumstances, this method isn t smart enough to read the exact type and direction of parameters. For example, if you run the DeriveParameters method on the byroyalty2 stored procedure that was defined in the preceding section, you ll see that the @avgprice output param; eter is incorrectly retrieved as an input/output parameter. You can remedy this problem either by manually adjusting the Direction property to Output or by assigning a dummy value to the @avgprice parameter before calling the stored procedure, even if this value will never be used. If you fail to take either of these steps, the ExecuteReader method will throw an exception.

Change Template. Publisher opens the Change Template window, which looks very similar to the Getting Started window. You can apply a different Quick Publication template to the open publication, or you can switch to an entirely different type of publication.

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Despite its defects, the DeriveParameters method fits the bill during the prototyping phase, but be prepared to replace it with code that populates the Parameters collection manually before you ship the application. Here s a tip: you should always reference your parameters by their names rather than by their indexes in the Parameters collec; tion so that you don t have to change your code if you switch from automatic to man; ual creation of the Parameters collection. And don t include the return value parameter (if the stored procedure doesn t have one):

This statement works regardless of how you fill the Parameters collection. cmd.Parameters( @percentage ).Value = 100

property lets you check that there are more rows to read without having to call the Read method:

Error 1 The type or namespace name 'dateTime' could not be found (are you missing a using directive or an assembly reference )

1

If Not dr.HasRows Then MsgBox( No rows match this condition ) Else Process the resultset. End If

It s important that you close the DataReader object when there are no more rows to pro; cess. This releases resources on both the client and the server and makes the connection available again for other commands. In fact, you can t issue any other command on a con; nection while a DataReader object is active on that connection. The only command you can perform on a connection actively serving a DataReader is the Close method. You can check whether a DataReader has been closed by means of its IsClosed property.

The DataReader object provides many properties and methods that let you read the value of the columns in the resultset. For starters, the Item read-only property gives you a means to access any field by either its name or its (zero-based) column index in a way that resem; bles the kind of access you perform with the Fields collection of the ADO Recordset:

Display the Name and City fields for each record. Do While dr.Read() Dim res As String = String.Format( {0} {1}", _ dr.Item( Name ), dr.Item( City )) Debug.WriteLine(res) Loop

The compiler is saying that it can t find anything called dateTime. It even suggests that you might need to add a using directive to identify the namespace that holds this item. (Of course, in this case it is wrong, in that you have misspelled something, rather than forgotten to tell the compiler where to look for it but at least the compiler is trying to help). As far as programmers are concerned, a namespace is a way they can make sure that when they invent an identifier for an object, it s unique in their namespace and won t be confused with an identically named resource in any other namespace. In fact, the next line of Program.cs sets up a namespace for your solution:

Item is the default member, so you can make your code more concise by omitting it:

original Getting Started window. Tip If the Getting Started window is closed, you can click New on the File menu of the Publication1 window to open it in a separate program window.