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using System.Runtime.InteropServices;
 
[DllImport("User32.DLL")]
public static extern bool SetSystemCursor(IntPtr hcur, uint id);
public const uint OCR_NORMAL = 32512;
public const uint OCR_IBEAM = 32513;
 
[DllImport("User32.DLL")]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam,
    IntPtr pvParam, uint fWinIni);
public const uint SPI_SETCURSORS = 87;
public const uint SPIF_SENDWININICHANGE = 2;
private void button1_Click(object sender, EventArgs e)
{
    //ÉèÖÃ
    SetSystemCursor(Cursors.WaitCursor.CopyHandle(), OCR_NORMAL);
    SetSystemCursor(Cursors.WaitCursor.CopyHandle(), OCR_IBEAM);
    //..¿ÉÒÔ¸ù¾ÝÇé¿ö¼Ó
}
 
private void button2_Click(object sender, EventArgs e)
{
    //»Ö¸´
    SystemParametersInfo(SPI_SETCURSORS, 0, IntPtr.Zero, SPIF_SENDWININICHANGE);
}
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private Point downPoint;
private Rectangle downRectangle;
private Rectangle lastRectangle;
 
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button != MouseButtons.Left) return;
    downPoint = e.Location;
    downRectangle =
        new Rectangle(0, 0, ((Control)sender).Width, pictureBox1.Height);
    downRectangle.Offset(((Control)sender).PointToScreen(new Point(0, 0)));
    ControlPaint.DrawReversibleFrame(
 


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