Cross thread calls between forms.

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C#

WinForms

threads

Hi, I have made an alarm system. What it does is that any system on the network broadcasts an UDP message on the network and other clients on the network receive that message and display it.
What I want to do is that, when the main form receives an alarm message it would show an other form with the message and if the computer which broadcasted the message sends a cancel alarm message the second form (showing alert message)should be closed on all the clients.

FrmAlertScreen frm = new FrmAlertScreen();

if (Convert.ToBoolean(alarm))//Set alarm to ring.
{
       status = "Ringing";
       RingAlarm = true;
       if (IsLocaly == false)//Alarm is not sent by local system then don't show alert screen.
       {
           frm.Show ();
       }

       IsLocaly = false;
}
else //Alram goes silent.
{
     
       status = "Silent";
       RingAlarm = false;
       frm.Hide() ;
       IsLocaly = false;
}

Problem with this code is that frm.show() makes the message form to go into wait probably because it was running in background thread.