String PROXY = "http://login:pass@proxy:port";       
 ChromeOptions options = new ChromeOptions();       
  options.AddArguments("user-data-dir=path/in/your/system");    
     Proxy proxy = new Proxy();    
     proxy.HttpProxy = PROXY;      
  proxy.SslProxy  = PROXY;     
   proxy.FtpProxy  = PROXY;   
      options.Proxy = proxy;        
 // Initialize the Chrome Driver    
    using (var driver = new ChromeDriver(options))