public static decimal CalcTotalRate(this UserMaster user)
{
using (SECURITY_DBEntities context = new SECURITY_DBEntities())
{
List <byte?> ratings = context.Ratings.Where(r => r.DriverId == user.UserID).Select(r => r.RateValue).ToList();
var TotalRate = ((decimal)ratings.Sum <byte?>(l => l.Value) / ratings.Count);
TotalRate = Math.Round(TotalRate, 2);
return(TotalRate);
}
}