public bool IsAvailable()
{
WebBrowser browser = new WebBrowser(new RequestConfig()
{
PageLoadTimeout = 5, Method = "POST"
});
var proxy = new WebProxy(this.Address, this.Port);
if (this.Credential != null)
{
proxy.Credentials = this.Credential;
}
browser.WebProxy = proxy;
var key = Guid.NewGuid().ToString();
var response = browser.DownloadString("http://bdatahub.com/api/ProxyTester.ashx", new Dictionary <string, string>()
{
{ "key", key }
});
return(response.PageSource == key);
}