如何在Listview ASP.NET中添加显示/隐藏密码按钮？

<asp:ListView ID="ListView1" runat="server">
    <ItemTemplate>
        <asp:Label ID="lblPassword" runat="server" Text='<%# Eval("Password") %>' TextMode="Password"></asp:Label>
        <asp:Button ID="btnTogglePassword" runat="server" Text="显示密码" OnClick="btnTogglePassword_Click" />
    </ItemTemplate>
</asp:ListView>

protected void btnTogglePassword_Click(object sender, EventArgs e)
{
    Button btnTogglePassword = (Button)sender;
    ListViewItem item = (ListViewItem)btnTogglePassword.NamingContainer;
    Label lblPassword = (Label)item.FindControl("lblPassword");

    if (btnTogglePassword.Text == "显示密码")
    {
        btnTogglePassword.Text = "隐藏密码";
        lblPassword.TextMode = TextBoxMode.SingleLine;
    }
    else
    {
        btnTogglePassword.Text = "显示密码";
        lblPassword.TextMode = TextBoxMode.Password;
    }
}