The base class includes the field 'btnLogin', but its type (FoodOrder.App_Code.LinkButtonDefault) is not compatible
<blockquote>
  <p>The base class includes the field
  'btnLogin', but its type
  (FoodOrder.App_Code.LinkButtonDefault)
  is not compatible with the type of
  control
  (FoodOrder.App_Code.LinkButtonDefault).</p>
</blockquote>

<p>aspx:</p>

<pre><code>&lt;%@ Register Namespace="FoodOrder.App_Code" TagPrefix="ac1" %&gt;
&lt;ac1:LinkButtonDefault ID="btnLogin" runat="server" Text="Prijava" CssClass="gumbek" 
                onclick="btnLogin_Click" /&gt;
</code></pre>

<p>LinkButtonDefault:</p>

<pre><code>namespace FoodOrder.App_Code
{
    public class LinkButtonDefault : LinkButton
    {
        protected override void OnLoad(System.EventArgs e)
        {
            Page.ClientScript.RegisterStartupScript(GetType(), "addClickFunctionScript",
                _addClickFunctionScript, true);

            string script = String.Format(_addClickScript, ClientID);
            Page.ClientScript.RegisterStartupScript(GetType(), "click_" + ClientID,
                script, true);
            base.OnLoad(e);
        }

        private const string _addClickScript = "addClickFunction('{0}');";

        private const string _addClickFunctionScript =
            @"  function addClickFunction(id) {{
            var b = document.getElementById(id);
            if (b &amp;&amp; typeof(b.click) == 'undefined') b.click = function() {{
                var result = true; if (b.onclick) result = b.onclick();
                if (typeof(result) == 'undefined' || result) {{ eval(b.getAttribute('href')); }}
            }}}};";
    }
}
</code></pre>

<p>aspx.designer.cs:</p>

<pre><code>protected global::FoodOrder.App_Code.LinkButtonDefault btnLogin;
</code></pre>

<p>Can someone explain me error?</p>
