public static List <RowColumns> Append(IEnumerable <RowColumns> c1, IEnumerable <RowColumns> c2)
{
var c = new List <RowColumns>();
foreach (var e1 in c1)
{
var row = e1.Row;
var e2 = c2.Where(x => x.Row == row).FirstOrDefault();
if (e2 != null)
{
var matches = MatchList.Append(e1.Matches, e2.Matches);
if (matches.Count > 0)
{
c.Add(new RowColumns(row, matches));
}
}
}
return(c);
}