using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class TablePrinter

    {

        private readonly string[] titles;

        private readonly List<int> lengths;

        private readonly List<string[]> rows = new List<string[]>();

​

        public TablePrinter(params string[] titles)

        {

            this.titles = titles;

            lengths = titles.Select(t => t.Length).ToList();

        }

​

        public void AddRow(params object[] row)

        {

            if (row.Length != titles.Length)

            {

                throw new System.Exception("Added row length [{row.Length}] is not equal to title row length [{titles.Length}]");

            }

            rows.Add(row.Select(o => o.ToString()).ToArray());

            for (int i = 0; i < titles.Length; i++)

            {

                if (rows.Last()[i].Length > lengths[i])

                {

                    lengths[i] = rows.Last()[i].Length;

                }

            }

        }

​

        public void Print()

        {

            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));

            System.Console.WriteLine("+");

​

            string line = "";

            for (int i = 0; i < titles.Length; i++)

            {

                line += "| " + titles[i].PadRight(lengths[i]) + ' ';

            }

            System.Console.WriteLine(line + "|");

​

            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));

            System.Console.WriteLine("+");

​

            foreach (var row in rows)

            {

                line = "";

                for (int i = 0; i < row.Length; i++)

                {

                    int n = 0;

                    if (int.TryParse(row[i], out n))

                    {

                        line += "| " + row[i].PadLeft(lengths[i]) + ' ';  // numbers are padded to the left

                    }

                    else

                    {

                        line += "| " + row[i].PadRight(lengths[i]) + ' ';

                    }

                }

                System.Console.WriteLine(line + "|");

            }

​

            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));

            System.Console.WriteLine("+");

        }

    }

    public static void Main()

    {

        var t = new TablePrinter("id", "Column A", "Column B");

        t.AddRow(1, "Val A1", "Val B1");

        t.AddRow(2, "Val A2", "Val B2");

        t.AddRow(100, "Val A100", "Val B100");

        t.Print();

    }

}