how to make linkbutton hide and show place holder

Question

I need to make the  place holder visible and invisible with link button but it is not working not like a normal button when I click on it

please help

<asp:LinkButton ID="link1" runat="server" Text="Forgot Password?"
OnClick="link1_Click">
 </asp:LinkButton><br />
   <asp:PlaceHolder ID="typeEmail" runat="server" Visible="false">
    <asp:TextBox ID="textbox1" Visible="false" runat="server" AutoComplete="off">
     </asp:TextBox>
      </asp:PlaceHolder>


code behind
protected void link1_Click(object sender, EventArgs e)
    {
        typeEmail.Visible = true;
       textbox1.Visible = true;
    }