The thread '<No Name>' (0xb24) has exited with code 0 (0x0)

whenever i try to run program for example,

if i have to run "frmphonebook" so in

Application.Run(new frmphonebook());

I typed but when i run it it run another form, and it happens to each and every form and it is displaying output as

The thread 'vshost.RunParkingWindow' (0x63c) has exited with code 0 (0x0).

The thread '<No Name>' (0xb24) has exited with code 0 (0x0).

how to solve this ?