Change the styling of the link if the page link being rendered is the current page.
You don't show how you render the entire "pager bar", but we do something similar:
for (int i = 1; i <= Model.PageCount; i++)
{
if (i == Model.PageNumber)
{
//this is the current page, so change the style of the link
@Html.ActionLink(String.Format("{0}", i.ToString()), "index", new { page = i, style = "style_of_current_page_link" })
}
else
{
//this is not the current page, so
@Html.ActionLink(String.Format("{0}", i.ToString()), "index", new { page = i })
}
@Html.Raw(" ")
}