Accessing LoginView (AnonymousTemplate and LoggedInTemplate) from UserControl Codebehind

Question

I'm trying to access AnonymousTemplate and LoggedInTemplate from UserControl's Code-Behind Page. 

Find my UserControl front-end code:

<LoggedInTemplate>

                Welcome again

                <br />

                <b><asp:LoginName ID="LoginName1" runat="server"/></b>

                <br />

                <asp:LoginStatus ID="LoginStatus1" runat="server" LoginText="Login" LogoutText="Logout"/>

                <br />

                <asp:HyperLink ID="HyperLink4" runat="server" NavigateUrl="/abc/profile">Account Section</asp:HyperLink>

                

                </LoggedInTemplate>

                <AnonymousTemplate>

                    <div style="text-align:center">

                    <asp:TextBox ID="txtUserName" runat="server" Height="15px" Width="120px"></asp:TextBox>

                    <br />

                    <asp:TextBox ID="txtPassword" runat="server" Height="15px" Width="120px" TextMode="Password"></asp:TextBox>

                    <br />

                    <asp:Button ID="btnLoginClick" runat="server" Text="Sign In" 

                            onclick="btnLoginClick_Click" />

                    <br />

                        <asp:Label ID="lblInvalidMsg" runat="server" Text="" Visible="false"></asp:Label>

                    

                    </div>

                </AnonymousTemplate>

Find my UserControl back-end code (VB, you may reply in c# too):

Dim sds As New SqlDataSource()

        sds.ConnectionString = ConfigurationManager.ConnectionStrings("ConnectionString1").ToString()

        Dim b As String = txtUserName.Text

        Dim c As String = txtPassword.Text

        sds.SelectParameters.Add("username", TypeCode.[String], b)

        sds.SelectParameters.Add("password", TypeCode.[String], c)

        sds.SelectCommand = "SELECT * FROM [users] WHERE [username] = @username AND [password] = @password"

Find my error:

Error: txtUserName and txtPassword is not declared.

What I use to access the controls placed under LoginView.