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private Point m_offset;
private Point m_Pos;

private void EM_MouseMove(object sender, MouseEventArgs e)
{
     if (e.Button == MouseButtons.Left)
     {
          m_Pos = Control.MousePosition;
          m_Pos.Offset(mouse_offset.X, mouse_offset.Y);
          Location = m_Pos;
     }
}

private void EM_MouseDown(object sender, MouseEventArgs e)
{
      m_offset = new Point(-e.X, -e.Y);
}