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public partial class Form1 : Form{
[DllImport("Gdi32.dll ")]
public static extern int SetPixel(IntPtr hDC, int x, int y, int color);
public Form1(){
InitializeComponent();
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
IntPtr hdc = e.Graphics.GetHdc();
for (int i = 0; i < 100; i++) {
SetPixel(hdc, 20, 20 + i, 0);
}
}
}