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Microsoft TS: Microsoft .NET Framework 2.0 - Web-based Client Development Sample Questions:

1. You are creating a Web application.
The Web application has a Web Form that contains a data grid named DgCustomers. You set the Web Form as asynchronous.
You write the following code segment in the code-behind file of the application.
Public Partial Class _Default Inherits System.Web.UI.Page Private connection As SqlConnection Private command As SqlCommand Private reader As SqlDataReader Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) AddOnPreRenderCompleteAsync(New BeginEventHandler(BeginAsyncOperation), New EndEventHandler(EndAsyncOperation)) End Sub End Class
You need to retrieve and bind data from the Customers table. You also need to ensure that Web requests are not blocked during database operation.
Which two code segments should you add to the code-behind file of the Web Form? (Each correct answer presents part of the solution. Choose two.)

A) Private Sub EndAsyncOperation(ByVal ar As IAsyncResult) reader = command.EndExecuteReader(ar) DgCustomers.DataSource = reader DgCustomers.DataBind() End Sub
B) Private Function BeginAsyncOperation(ByVal sender As Object, ByVal e As EventArgs, ByVal cb As AsyncCallback, ByVal extradata As Object) As IAsyncResult connection = New SqlConnection("Data Source=.;Initial Catalog=Contoso;Integrated Security=True; Asynchronous Processing=True") connection.Open() command = New SqlCommand("Select * from Customers", connection) Return command.BeginExecuteReader(cb, extradata, CommandBehavior.CloseConnection) End Function
C) Private Function BeginAsyncOperation(ByVal sender As Object, ByVal e As EventArgs, ByVal cb As AsyncCallback, ByVal extradata As Object) As IAsyncResult connection = New SqlConnection("Data Source=.;Initial Catalog=Contoso;Integrated Security=True;Asynchronous Processing=True") connection.Open() command = New SqlCommand("Select * from Customers", connection) Return cb.BeginInvoke (Nothing, EndAsyncOperation, extradata) End Function
D) Private Sub EndAsyncOperation(ByVal ar As IAsyncResult) reader = command.ExecuteReader(CommandBehavior.CloseConnection) DgCustomers.DataSource = reader DgCustomers.DataBind() End Sub

2. You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.
Dim ar As IAsyncResult = cmd.BeginExecuteReader()
You need to execute a method named DoWork() that takes one second to run while the SQL query is
executing.
DoWork() must run as many times as possible while the SQL query is executing.
Which code segment should you use?

A) While ar.AsyncWaitHandle Is Nothing DoWork() End While dr = cmd.EndExecuteReader(ar)
B) While Not ar.IsCompleted DoWork() End While dr = cmd.EndExecuteReader(ar)
C) While Thread.CurrentThread.ThreadState = ThreadState.Running DoWork() End While dr = cmd.EndExecuteReader(ar)
D) While Not ar.AsyncWaitHandle.WaitOne() DoWork() End While dr = cmd.EndExecuteReader(ar)

3. You are developing a Microsoft ASP.NET inventory management application. You need to set output-cache expirations to meet the following requirements: The Web page is cached only for one hour.
A single instance of the Web page is maintained in the cache. Secondary storage of sensitive information does not occur. Which directive should you use?

A) <%@ OutputCache Duration="3600" VaryByParam="*" NoStore="false" %>
B) <%@ OutputCache Duration="3600" VaryByParam="none" NoStore="true" %>
C) <%@ OutputCache Duration="60" VaryByControl="none" NoStore="true" %>
D) <%@ OutputCache Duration="60" VaryByControl="*" NoStore="false" %>

4. You are creating a Web Form to report on orders in a database. You create a DataSet that contains Order
and OrderDetails tables.
You add a relationship between the tables by using the following code segment.
Dim dtOrders As DataTable = dsOrders.Tables("Orders")
Dim dtOrderDetails As DataTable = _
dsOrders.Tables("OrderDetails")
Dim colParent As DataColumn = dtOrders.Columns("OrderID")
Dim colChild As DataColumn = _
dtOrderDetails.Columns("OrderID") dsOrders.Relations.Add("Rel1", colParent, colChild, False)
You need to calculate the total quantity of items for each order by adding the values in the Quantity column in the OrderDetails rows for each order.
Which code segment should you use?

A) Dim childRow As DataRow For Each childRow In dtOrders.Rows currQty = 0 Dim parentRow As DataRow For Each parentRow In childRow.GetParentRows("Rel1") currQty += Convert.ToInt32(childRow("Quantity")) Next parentRow ShowQty(currQty) Next childRow
B) Dim parentRow As DataRow For Each parentRow In dtOrders.Rows currQty = 0 Dim childRow As DataRow For Each childRow In dtOrderDetails.Rows currQty += Convert.ToInt32(childRow("Quantity")) Next childRow ShowQty(currQty) Next parentRow
C) Dim parentRow As DataRow For Each parentRow In dtOrders.Rows currQty = 0 Dim childRows As DataRow() = _ parentRow.GetChildRows("Rel1") currQty += childRows.Length ShowQty(currQty) Next parentRow
D) Dim parentRow As DataRow For Each parentRow In dtOrders.Rows currQty = 0 Dim childRow As DataRow For Each childRow In parentRow.GetChildRows("Rel1") currQty += Convert.ToInt32(childRow("Quantity")) Next childRow ShowQty(currQty) Next parentRow

5. You create a mobile Web application.
You need to use a Command control to post user input from the UI elements back to the server.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution.
Choose two.)

A) Place the Command control within an instance of the System.Web.UI.MobileControls.ObjectList control.
B) Place the Command control within an instance of the System.Web.UI.MobileControls.Form control.
C) Place the Command control within an instance of the System.Web.UI.MobileControls.Panel control.
D) Place the Command control within an instance of the System.Web.UI.MobileControls.SelectionList control.

Solutions: