//the method adds a figure to the FigureList class, and draws the desired figure (Rectangle)
private void button2_Click(object sender, EventArgs e)
{
figlist.figarray.Add("Rec");
using (grx = Graphics.FromImage(bmp))
{
grx.DrawRectangle(Pens.Black, figlist.GetRectangle(Convert.ToInt32(textBox8.Text), Convert.ToInt32(textBox7.Text), Convert.ToInt32(textBox6.Text), Convert.ToInt32(textBox5.Text)));
}
pictureBox1.Image = bmp;
}