progress bar showing server side function's progress

I wanna show the progress of the server side c# function in asp.net page.
for example my server side function look like this..
public void serversidefun(ArrayList empname)
{
int percentge = 0;
for(int i=0; i <= empname.length ; i++) sss 
{
// call  another function to process each employee
secondfunction(empname[i] )
percentge+= 100/empname.length; // i wannt to display this value to  asp.net web page for every loop
} 
}