private void btnMaximize_Click(object sender, EventArgs e)
{
if (this.WindowState == FormWindowState.Normal)
{
this.WindowState = FormWindowState.Maximized;
btnMaximize.Image = Resources.MaximizePlus;
}
else
{
this.WindowState = FormWindowState.Normal;
btnMaximize.Image = Resources.MaximizeMinus;
}
}