you create a microsoft asp net application by using the framework..., Appendix,

Question: You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create two user controls named UserCtrlA.ascx and UserCtrlB.ascx. The user controls postback to the server. You create a new Web page that has the following ASPX code.
 <asp:CheckBox ID="Chk" runat="server"
 oncheckedchanged="Chk_CheckedChanged" AutoPostBack="true" /> <asp:PlaceHolder ID="PlHolder" runat="server"></asp:PlaceHolder> To dynamically create the user controls, you write the following code segment for the Web page.
 public void LoadControls()
 {
 if (ViewState["CtrlA"] != null)
 {
 Control c;
 if ((bool)ViewState["CtrlA"] == true)
 { c = LoadControl("UserCtrlA .ascx"); }
 else
 { c = LoadControl("UserCtrlB.ascx"); }

A ID = "Ctrl";
PlHolder.Controls.Add(c);
}
}
protected void Chk_CheckedChanged(object sender, EventArgs e) {
ViewState["CtrlA"] = Chk.Checked;
PlHolder.Controls.Clear();
LoadControls();
}
 
B protected override object SaveViewState()
{
LoadControls();
return base.SaveViewState();
}
 
C protected override void Render(HtmlTextWriter writer) {
LoadControls();
base.Render(writer);
}
 
D protected override void OnLoadComplete(EventArgs e)
{
base.OnLoadComplete(e);
LoadControls();
}
 
E protected override void LoadViewState(object savedState) {
base.LoadViewState(savedState);
LoadControls();
}

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A ID = "Ctrl";PlHolder.Controls.Add(c);}}protected void Chk_CheckedChanged(object sender, EventArgs e) {ViewState["CtrlA"] = Chk.Checked;PlHolder.Controls.Clear();LoadControls();}

B protected override object SaveViewState(){LoadControls();return base.SaveViewState();}

C protected override void Render(HtmlTextWriter writer) {LoadControls();base.Render(writer);}

D protected override void OnLoadComplete(EventArgs e){base.OnLoadComplete(e);LoadControls();}

E protected override void LoadViewState(object savedState) {base.LoadViewState(savedState);LoadControls();}

D

A
ID = "Ctrl";
PlHolder.Controls.Add(c);
}
}
protected void Chk_CheckedChanged(object sender, EventArgs e) {
ViewState["CtrlA"] = Chk.Checked;
PlHolder.Controls.Clear();
LoadControls();
}

B
protected override object SaveViewState()
{
LoadControls();
return base.SaveViewState();
}

C
protected override void Render(HtmlTextWriter writer) {
LoadControls();
base.Render(writer);
}

D
protected override void OnLoadComplete(EventArgs e)
{
base.OnLoadComplete(e);
LoadControls();
}

E
protected override void LoadViewState(object savedState) {
base.LoadViewState(savedState);
LoadControls();
}