Need to Restart visual studio programatically

Hi ,

        Am newer to Vs packages,I have created a Vs Package in which I have a button which will call a exe (eg:Installer.exe)after the exe get executed visual studio should get restart,

i have used the following snippet

 System.Diagnostics.Process p = new System.Diagnostics.Process();
            p.StartInfo.FileName = "Installer.exe";
            p.Start(); 
            var obj = (IVsShell4)this.GetService(typeof(SVsShell));

               (obj as IVsShell4).Restart((uint)__VSRESTARTTYPE.RESTART_Normal);

with this code the vs get restarted before the completion of exe's execution.

what i need is on button click exe should called and some installation shoud be performed based on the exe,after that vs should get restart.anyone please provide solution on this

Kani