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Question 25: You create an application by using the Microsoft .NET Framework 3.5 and Microsoft ADO.NET. The
application connects to a Microsoft SQL Server 2005 database.
The connection string of the application is defined in the following manner.
"Server=Prod;Database=WingtipToys;Integrated
Security=SSPI;Asynchronous Processing=true"
The application contains the following code segment. (Line numbers are included for reference only.)
01 Protected Sub UpdateData(ByVal cmd As SqlCommand)
02 cmd.Connection.Open()
03
04 lblResult.Text = "Updating ..."
05 End Sub
The cmd object takes a long time to execute.
You need to ensure that the application continues to execute while cmd is executing.
What should you do?
A. Insert the following code segment at line 03.
cmd.BeginExecuteNonQuery(New AsyncCallback( _
AddressOf UpdateComplete), cmd)
Add the following code segment.
Private Sub UpdateComplete (ByVal ar As IAsyncResult)
Dim count As Integer = CInt(ar.AsyncState)
LogResults(count)
End Sub
B. Insert the following code segment at line 03.
cmd.BeginExecuteNonQuery(New AsyncCallback( _
AddressOf UpdateComplete), cmd)
Add the following code segment.
Private Sub UpdateComplete(ByVal ar As IAsyncResult)
Dim cmd As SqlCommand = DirectCast(ar.AsyncState, SqlCommand)
Dim count As Integer = cmd.EndExecuteNonQuery(ar)
LogResults(count)
End Sub
C. Insert the following code segment at line 03.
AddHandler cmd.StatementCompleted, AddressOf UpdateComplete
cmd.ExecuteNonQuery()
Add the following code segment.
Private Sub UpdateComplete(ByVal sender As Object, _
ByVal e As StatementCompletedEventArgs)
Dim count As Integer = e.RecordCount
LogResults(count)
End Sub
D. Insert the following code segment at line 03.
Dim notification As New _
SqlNotificationRequest("UpdateComplete ", "", 10000)
cmd.Notification = notification
cmd.ExecuteNonQuery()
Add the following code segment.
Private Sub UpdateComplete (ByVal notice As SqlNotificationRequest)
Dim count As Integer = Integer.Parse(notice.UserData)
LogResults(count)
End Sub
Correct Answer: B