private void webToolStripMenuItem_Click(object sender, EventArgs e) { if (frmMapPoint != null) if (frmMapPoint.Visible == true) frmMapPoint.Visible = false; if (frmSatelliteMap != null) { if( frmSatelliteMap.Visible == false) frmSatelliteMap.Visible = true; } else { frmSatelliteMap = new frmMap(); frmSatelliteMap.Show(); } }