void Render()
{
if (_chart == null)
{
pictureBox1.Image = null;
}
else
{
_chart.Width = pictureBox1.Width;
_chart.Height = pictureBox1.Height;
pictureBox1.Image = _chart.DrawBarColumn();
//pictureBox1.Image = Draw(pictureBox1.Width, pictureBox1.Height, _grid);
}
}