hi how to set alter colors in css using MVC

@model List<TestMVC4.Data.Country>

@{
    ViewBag.Title = "SearchView";
}

<h2>SearchView</h2>
 @{bool isalter = false;}
  @{string className = "";}
<table  style="width:60%">
<tr>
<th>Country ID</th>
<th>Country Name</th>
<th>View States</th>
</tr>
@foreach (var country in Model)
{
  if(isalter)
  {
      className="FirstRow";
      isalter=false;
  }
else
  {isalter=true;
      className="SecondRow"; 
  }
  <tr class=@className>
  <td>@country.CountryID</td>
  <td>@country.CountryName</td>
  <td>@Html.ActionLink("ViewStates", "redirect", new {countryCode=country.CountryID })</td>
</tr>
    }
</table>