private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";

            for(int iDan = 1; iDan < 10; ++iDan)
            {
                for(int i = 1; i < 10; ++i)
                {
                    textBox1.Text += iDan + " X " + i + " = " + (iDan * i) + Environment.NewLine;
                }
                textBox1.Text += Environment.NewLine;
            }
        }

private void button2_Click(object sender, EventArgs e)
        {
            uint uDan = 1;
            uint uDuisutja = 1;

            textBox2.Text = "";

            while(uDan < 10)
            {
                while(uDuisutja < 10)
                {
                    textBox2.Text += uDan + " X " + uDuisutja + " = " + (uDan * uDuisutja) + Environment.NewLine;
                    uDuisutja++;
                }
                uDan++;
                uDuisutja = 1;
                textBox2.Text += Environment.NewLine;
            }
        }

private void button3_Click(object sender, EventArgs e)
        {
            uint uDan = 1;
            uint uDuisutja = 1;

            textBox3.Text = "";
            do
            {
                do
                {
                    textBox3.Text += uDan + " X " + uDuisutja + " = " + (uDan * uDuisutja) + Environment.NewLine;
                    uDuisutja++;
                } while (uDuisutja < 10);
                    uDan++;
                uDuisutja = 1;
                textBox3.Text += Environment.NewLine;
            } while (uDan < 10);
        }

private void button4_Click(object sender, EventArgs e)
        {
            uint uDan = 1;
            uint uDuisutja = 1;

            textBox4.Text = "";

            while (true)
            {
                while (true)
                {
                    textBox4.Text += uDan + " X " + uDuisutja + " = " + (uDan * uDuisutja) + Environment.NewLine;
                    uDuisutja++;
                    if (uDuisutja == 10)
                        break;
                }
                uDan++;
                uDuisutja = 1;
                textBox4.Text += Environment.NewLine;

                if (uDan == 10)
                    break;
            }
        }

private void button5_Click(object sender, EventArgs e)
        {
            uint[] uGuGuDan = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

            textBox5.Text = "";
            foreach(uint uDan in uGuGuDan)
            {
                foreach(uint uDuisutja in uGuGuDan)
                {
                    textBox5.Text += uDan + " X " + uDuisutja + " = " + (uDan * uDuisutja) + Environment.NewLine; 
                }
                textBox5.Text += Environment.NewLine;
            }
        }