If you are using C#3 a good tip is to create an extension method to make this even simpler. Just create a static method (preferably in a static class) like so:
public static class Extensions
{
public static string HtmlEncode(this string s)
{
return HttpUtility.HtmlEncode(s);
}
}
You can then do neat stuff like this:
string encoded = "<div>I need encoding</div>".HtmlEncode();