70-528 NET Framework 2.0-Web-based Client Development Brain Dump

Demo Question 5.

You work as a Microsoft ASP.NET developer at EliteCertify.com. EliteCertify.com uses the Microsoft Visual Studio .NET 2005 as their application development platform. You use a Microsoft Windows XP Professional client computer named EliteCertify -WS528 as your development computer. Internet Information Services (IIS) is installed on EliteCertify -WS528. You are developing a custom control named ProductsGrid that will be used in the redevelopment of EliteCertify.com's e-Commerce Web applications. The ProductsGrid control contains a TextBox control and a DropDownList control that allows for the editing of product descriptions. The code for the ProductsGrid control is shown in the following exhibit. <ParseChildren(True)> Public Class ProductsGrid Inherits Control Implements INamingContainer Private _desc As Desc Private _descTemplate As ITemplate Public Property Desc() As Desc Get Return _desc End Get Set(ByVal value As Desc) _desc = value End Set End Property <TemplateContainer(GetType(DescTemplateContainer))> _ Public Property DescTemplate() As ITemplate Get Return _descTemplate End Get Set(ByVal value As ITemplate) _descTemplate = value End Set End Property Protected Overrides Sub CreateChildControls() 'ToDO End Sub End Class Public Class DescTemplateContainer Inherits Control Implements INamingContainer Private _desc As Desc Public Sub New(ByVal desc As Desc) _desc = desc End Sub Public Property Desc() As Desc Get Return _desc End Get Set(ByVal value As Desc) _desc = value End Set End Property End Class You need to ensure that the content specified in the DescTemplate() property is rendered by the ProductsGrid control. You need to override the CreateChildControls method to accomplish this. What code segment should you use?

A. If (Me.DescTemplate Is Nothing) Then Me.Controls.Clear() Dim templateContainer As DescTemplateConainer = New DescTemplateContainer(_desc) Me.Controls.Add(templateContainer) End If
B. If (Me.DescTemplate Is Nothing) Then Me.Controls.Clear() Dim templateContainer As DescTemplateConainer = New DescTemplateContainer(_desc) Me.DescTemplate.InstantiateIn(templateConainer) Me.Controls.Add(templateContainer) End If
C. If (Not Me.DescTemplate Is Nothing) Then Me.Controls.Clear() Dim templateContainer As DescTemplateConainer = New DescTemplateContainer(_desc) Me.Controls.Add(templateContainer) End If
D. If (Not Me.DescTemplate Is Nothing) Then Me.Controls.Clear() Dim templateContainer As DescTemplateConainer = New DescTemplateContainer(_desc) Me.DescTemplate.InstantiateIn(templateConainer) Me.Controls.Add(templateContainer) End If


Display Answer

Answer: D

Explanation: You must first determine that the DescTemplate property has returned content and then render the content. You can accomplish this by creating an instance of DescTemplateContainer that holds the content and then add the container to the ProductsGrid control for rendering. Incorrect