public double CalculateTotalMinutesOfTopNumber(int lineId)
{
lock (obj)
{
string destinationNumber = callManager.GetCallsDtos(lineId).Max(l => l.DestinationNumber);
if (lineManager.GetLineByNumber(destinationNumber) != null)
{
double totalMinutesOfTopNumber = callManager.GetCallsDtos(lineId).Where(l => l.DestinationNumber == destinationNumber).Sum(l => l.Duration);
return(totalMinutesOfTopNumber);
}
return(0);
}
}