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ÔÚ´°ÌåPAINTʼþÖУº
{
    int i = 0;
    int j = 0;
    Graphics g = default(Graphics);
    g = e.Graphics;
    Pen bluepen = new Pen(Color.Blue, 2);
   
    for (i = 0; i <= 250; i += 50) {
        //»­Ë®Æ½Ïß
        g.DrawLine(bluepen, 0, i, 250, i);
    }
   
    for (j = 0; j <= 250; j += 50) {
        //»­´¹Ö±Ïß
        g.DrawLine(bluepen, j, 0, j, 250);
    }
}

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ÔÚ´°ÌåPAINTʼþÖУº
{
    int i = 0;
    int j = 0;
    Graphics g = default(Graphics);
    g = e.Graphics;
    Pen bluepen = new Pen(Color.Blue, 2);

    for (i = 0; i  <= 250; i += 50) {
        //»­Ë®Æ½Ïß
        g.DrawLine(bluepen, 0, i, 250, i);
    }

    for (j = 0; j  <= 250; j += 50) {