void Randomize <T>(MetadataTable <T> tbl)
{
T[] t = tbl.OfType <T>().ToArray();
for (int i = 0; i < t.Length; i++)
{
T tmp = t[i];
int j = Random.Next(0, t.Length);
t[i] = t[j];
t[j] = tmp;
}
tbl.Clear();
foreach (var i in t)
{
tbl.AddRow(i);
}
}