for(int i=0;i<10;i++)
{
    Run_Project1(i)          // Pass i as argument to project 1.
    Run_Project2(i)
    // do something with results
}

while( itPleasesYou ){
    system("Path/proj1.exe args");
    system("Path/proj2.exe args");
}

FOR /L %%i IN (1,1,10) DO (
devenv "project%%i.vcxproj" /RunExit
)