Unable to hide elements from CSS using ASP.NET4

i am unable to hide my asp:buttons from CSS. i am using ASP.NET 4

CSS

.Sit开发者_如何学运维eButton
{
    display: none;
    visibility: hidden;
}

HTML

<asp:Button ID="btnFromCalOpen" runat="server" Text=" &gt; " class = "siteButton"   />

Please Help

Change class="siteButton" to CssClass="SiteButton"

CSS is case-sensitive for class names and siteButton is different from SiteButton.

Also in ASP.NET the class is set by CssClass rather than class, however class will still work since ASP.NET will pass through unknown properties to the browser.