Problem about get content with ASP.NET (.NET Framework 3.5)

  <FCKeditorV2:FCKeditor ID="FCKeditor1" runat="server" BasePath="~/fckeditor/">
            </FCKeditorV2:FCKeditor>

  protected void btnUpdate_Click(object sender, EventArgs e)
        {
          
            lblContent.Text = FCKeditor1.Value; 
}