public int CreateFilterCopy(int filterId)
{
int key = System.DateTime.UtcNow.Ticks.GetHashCode();
while (_filterList.ContainsKey(key))
{
key++;
}
if (_filterList.ContainsKey(filterId))
{
_filterList.Add(key, FilterData.DeepCopy <FilterData>(_filterList[filterId]));
}
else
{
throw new Exception("no filter");
}
return(key);
}