public override void RemoveRange(int index, int count)
{
if (index < 0 || count < 0)
throw new ArgumentOutOfRangeException(index < 0 ? nameof(index) : nameof(count), SR.ArgumentOutOfRange_NeedNonNegNum);
Contract.EndContractBlock();
if (_list.Count - index < count)
throw new ArgumentException(SR.Argument_InvalidOffLen);
if (count > 0) // be consistent with ArrayList
_version++;
while (count > 0)
{
_list.RemoveAt(index);
count--;
}
}