public void RemoveServer(Server s)
{
// filter out the server from our list of servers
var filtered = ServerModel.Servers.Where(x => x.EndPoint != s.EndPoint);
// write addresses to file
var addresses = filtered.Select(x => x.EndPoint.ToString()).ToArray();
File.WriteAllLines(savefile, addresses);
ServerModel.RemoveServer(s.EndPoint.ToString());
}