Localhost with Port Number connection refused

[ergodaveh]

After downloading the Sample I've attempted to run sample WebSocket-Samples-master\AspNetWebSocketEcho using a port number without success. Whenever localhost has a Port Number such as localhost:57570, The connection errors with this notice "WebSocket connection to 'ws://localhost/WebSocket-Samples-master/AspNetWebSocketEcho/echohandler.ashx' failed: Error during WebSocket handshake: Unexpected response code: 500"

[grockland]

Having same problem in how to structure the ws: string with localhost. and are these directory entries? and is there documentation for the .ashx file that displays script like:

<%@ WebHandler Language="C#" CodeBehind="xHandler.ashx.cs" Class="IPRxWeb.xHandler" %>