Bandwidth limit for each user

hi

i am new in IIS and  asp.net. i want to limit bandwidth of download and upload in IIS and my limit is for each user.

my scenario is limit bandwidth of upload and download for user1 to 1M and limit bandwidth of upload and download for user2 to 4M.

in IIS we can set "

maxBandwidth

so how can i limit maximum bandwidth for each user in IIS?

if i can't set for each user can i set one limit bandwidth for all user? for example 1M for each user.