Function to remove null values from a main list and removes values from other relating lists at same index.

CheckForNull.cs

// Doesn't work bcz ref and params doens't work. I now this was a concious decision by developers. 
// This doesn't work. But it is kinda what 'pythonic'.
private void CheckForNull<T, T2>(ref List<T> listOfObjs, ref params List<T2>[] otherLists)
{
    for (int i = listOfObjs.Count; i >= listOfObjs.Count; i--)
    {
        var o = listOfObjs[i];
        if (o == null)
        {
            listOfObjs.RemoveAt(i);
            foreach (List<T2> otherList in otherLists)
            {
                otherList.RemoveAt(i);
            }
        }
    }
}

// Way that does work but is not generic. Want to be generic so I don't need to write functions for different numbers of arguments.
private void CheckForNull<T1, T2, T3>(ref List<T1> listOfObjs, ref List<T2> otherList, ref List<T3> anotherList)
{
    for (int i = listOfObjs.Count; i >= listOfObjs.Count; i--)
    {
        var o = listOfObjs[i];
        if (o == null)
        {
            listOfObjs.RemoveAt(i);
            otherList.RemoveAt(i);
            anotherList.RemoveAt(i);
            
        }
    }
}