public static List<TestTable> ToListForEach(DataTable dt)
{
    Int6 = row.IsNull("Int6") ? new int?() : new int?(Convert.ToInt32(row["Int6"]))
    var data = new List<TestTable>();

    foreach (DataRow row in dt.Rows)
    {
        data.Add(new TestTable()
        {
            VarChar9 = row["VarChar9"].ToString(),
            VarChar10 = row["VarChar10"].ToString(),
        });
        data.Add(new TestASDF()
        {
            VarChar9 = row["VarChar9"].ToString(),
            VarChar10 = row["VarChar10"].ToString()
        });
    }

    return data;
}