جابجا کردن فرم با کلیک بر روی هر قسمت از آن - بدون استفاده از توابع api

private bool dragging;
private Point pointClicked;
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        // Turn drag mode on and store the point clicked.
        dragging = true;
        pointClicked = new Point(e.X, e.Y);
    }
    else
    {
        dragging = false;
    }
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
    if (dragging)
    {
        Point pointMoveTo;
        // Find the current mouse position in screen coordinates.
        pointMoveTo = this.PointToScreen(new Point(e.X, e.Y));
        // Compensate for the position the control was clicked.
        pointMoveTo.Offset(-pointClicked.X, -pointClicked.Y);
        // Move the form.
        this.Location = pointMoveTo;
    }
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
    dragging = false;
}

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