private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
WinFormHelper.ReleaseCapture();
WinFormHelper.SendMessage(Handle, WinFormHelper.WmNclbuttondown, WinFormHelper.HtCaption, 0);
}
else if (e.Button == MouseButtons.Right)
{
ctxMenu.Visible = true;
ctxMenu.Location = MousePosition;
}
}