private void MoveMatrice_Event(object sender, MouseEventArgs e)
{
int nr = 0, i = 0, j = 0;
Button b = (Button)sender;
nr = Convert.ToInt32(b.Name.Substring(6, b.Name.Length - 6));
i = nr / 20;
j = nr % 20;
view.setIndexLoc(i, j);
}