using System;
using System.Drawing;
using System.Windows.Forms;

namespace TestButton2
{
    public partial class Form1 : Form
    {
        private Int32? Number = null;        

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Bitmap newBitmap;

            //Для кнопки 1
            newBitmap = new Bitmap(30, 30);
            using (Graphics g = Graphics.FromImage(newBitmap))
            {
                g.DrawRectangle(new Pen(Color.Gray, 1), 2, 4, 23, 21);
                g.DrawLine(new Pen(Color.Black, 3), new Point(2, 4), new Point(25, 23));
                g.Dispose();
            }
            AddAButton("button1", "1", 10, 20, newBitmap);

            //Для кнопки 2
            newBitmap = new Bitmap(30, 30);
            using (Graphics g = Graphics.FromImage(newBitmap))
            {
                g.DrawRectangle(new Pen(Color.Gray, 1), 2, 4, 23, 21);
                g.DrawLine(new Pen(Color.Black, 3), new Point(2, 26), new Point(25, 7));
                g.Dispose();
            }
            AddAButton("button2", "2", 10, 60, newBitmap);           
        }                

        //Общий метод Click для всех button
        private void commonbutton_Click(object sender, EventArgs e)
        {         
            Number = Convert.ToInt32((sender as Button).Text);
            DisplayingTheResult();
        }

        //Добавление кнопки
        private void AddAButton(string name, string text, Int32 x, Int32 y, Bitmap bmp)
        {
            Button button = new Button();
            button.Name = name;
            button.Text = text;
            button.Location = new Point(x, y);
            button.Size = new Size(75, 30);
            groupBox1.Controls.Add(button);
            button.Click += commonbutton_Click;
            button.ImageAlign = ContentAlignment.MiddleLeft;
            button.TextAlign = ContentAlignment.MiddleRight;
            button.Image = bmp;
        }

        //Отображаем результат
        private void DisplayingTheResult()
        {
            MessageBox.Show("Нажата кнопка " + Number.ToString(), "Результат", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }       
        
    }
}