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我在 Login 控件内有几个文本框，它位于 LoginView 内。如何使用 findcontrol 获取文本框？以下不起作用：获取错误：对象引用未设置为对象的实例。

Dim UName As TextBox = CType(LoginView1.FindControl("Login1").FindControl("UserName"), TextBox)

Or

Dim Logins As Login = CType(LoginView1.FindControl("Login1"), Login)
    Dim UName As TextBox = CType(Logins.FindControl("UserName"), TextBox)

aspx

<asp:LoginView ID="LoginView1" runat="server">
            <LoggedInTemplate>
                <div class="logged">                        
                    <ul class="Logged">
                        <li><asp:LoginStatus ID="LoginStatus1" Font-Size="Small" LogoutPageUrl="http://NCOASouth.com" LogoutAction="Redirect" runat="server" /></li>
                        <li><asp:HyperLink ID="AdminLink" Visible="false" runat="server" NavigateUrl="~/Admin/Default.aspx" Text="Administration"></asp:HyperLink></li>
                        <li>Welcome, <asp:LoginName ID="LoginName1" runat="server" />!</li>

                    </ul>
                </div>


            </LoggedInTemplate>
            <AnonymousTemplate>
                <h2 class="title1">Officials Login</h2>             
                    <br /><br /><br />
                    <asp:Login ID="Login1" DestinationPageUrl="http://NCOASouth.com/redirect.aspx"
                                CreateUserText="create new account" CreateUserUrl="~/Register.aspx" runat="server">
                                <LayoutTemplate>
                                    <asp:TextBox ID="UserName" CssClass="textbox" runat="server" Width="195px" placeholder="Username"></asp:TextBox><br />
                                    <asp:TextBox ID="Password" CssClass="textbox" runat="server" TextMode="Password" Width="195px" placeholder="Password"></asp:TextBox><br /><br />
                                    <asp:Button ID="LoginButton" ValidationGroup="ctl00$Login1" CssClass="textbox" runat="server" CommandName="Login" Width="200px" Text="Sign In"/>
                                    <br /><br />
                                    <asp:HyperLink ID="createnewuser" runat="server" NavigateUrl="~/Register.aspx" Text="Register for Free" /><br />
                                    <asp:HyperLink ID="forgotpassword" runat="server" NavigateUrl="~/forgotPassword.aspx" Text="Forgot Password" />

                                    <asp:Literal ID="FailureText" runat="server" EnableViewState="False"></asp:Literal>
                                    <br />
                                    <asp:RequiredFieldValidator ID="UserNameRequired" runat="server"
                                        ControlToValidate="UserName" ErrorMessage="User Name is required."
                                        ToolTip="User Name is required." ValidationGroup="ctl00$Login1"></asp:RequiredFieldValidator>
                                    <br />
                                    <asp:RequiredFieldValidator ID="PasswordRequired" runat="server"
                                        ControlToValidate="Password" ErrorMessage="Password is required."
                                        ToolTip="Password is required." ValidationGroup="ctl00$Login1"></asp:RequiredFieldValidator>
                                </LayoutTemplate>
                            </asp:Login>
            </AnonymousTemplate>
        </asp:LoginView>
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