The "easy" option would be to just iterate the list in reverse order without actually changing the list itself instead of trying to reverse it the first time and know to do nothing the other times:
foreach (string t1 in t.List.AsEnumerable().Reverse())
{
//Some code
}
By using the LINQ Reverse
method instead of the List
Reverse, we can iterate it backwards without mutating the list. The AsEnumerable
needs to be there to prevent the List
Reverse
method from being used.