Checking if Sharepoint SP group exists?

//Check if a group exists in a website
var groupInWeb = GroupExistsInWebSite(SPContext.Current.Web, "MyGroupName");

//Check if a group exists in a site collection
var groupInSite = GroupExistsInSiteCollection(SPContext.Current.Web, "MyGroupName");

private  bool GroupExistsInWebSite(SPWeb web, string name)
{
    return web.Groups.OfType<SPGroup>().Count(g => g.Name.Equals(name, StringComparison.InvariantCultureIgnoreCase)) > 0;
}
private bool GroupExistsInSiteCollection(SPWeb web, string name)
{
    return web.SiteGroups.OfType<SPGroup>().Count(g => g.Name.Equals(name, StringComparison.InvariantCultureIgnoreCase)) > 0;
}