C# - Ajax Server Process With Live Interface Progress Status?

I have a process that retrieves html from a remote site and parses it. I pass several URL's into the method, so I would like to ajaxify the process and give a screen notification each time a URL completes parsing. For example, this is what I am trying to do:

List<string> urls = ...//load up with arbitary # of urls
foreach (var url in urls)
{
string html = GetContent(url);
//DO SOMETHING
//COMPLETED.. SEND NOTIFICATION TO SCREEN (HOW DO I DO THIS)
}
public static string GetContent(string url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET"
using (var stream = request.GetResponse().GetResponseStream())
{
using (var reader = new StreamReader(stream, Encoding.UTF8))
{
return reader.ReadToEnd();
}
}
}

In each iteration in the loop, I want to show the URL was completed and moving on to the next one. How can I accomplish this?