winforms - Limiting Network Bandwidth Programmatically using C# -

i'm developing application in c# find number of users accessing router (this part done) no.of users need split total n/w bandwidth among each users locally such that

userbandwidth = (overallallbandwidth / numberofcurrentusers)

now need methodology limit bandwidth per no.of users in c# win form

i referred these links http://www.codeproject.com/kb/ip/bandwidth_throttling.aspx

but these helps limit on application.

my requirement such apply limitation nic itself.

for eg:

my n/w b/w 1mbps 2 users using in n/w

then code should limit 500kbps each users through app locally.