Hi, In this post let me explain you about how to verify if  the remote files exist or not in ASP.NET 5.  Sometimes we need to verify if a file exists remotely such as javascript or image file.  Suppose you are in server(xxx.com) and you want to check a file in another server(xxxxxx.com) - in this case it will be helpful. And now, write the following code snippet.

Using HTTPWebRequest:
private bool RemoteFileExistsUsingHTTP(string url)
{
try
{
 //Creating the HttpWebRequest
 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
 //Setting the Request method HEAD, you can also use GET too.
  request.Method = "HEAD";

  //Getting the Web Response
  HttpWebResponse response = request.GetResponse() as HttpWebResponse;

  //Returns TURE if the Status code == 200
  return (response.StatusCode == HttpStatusCode.OK);
}
catch
{
//Any exception will returns false.
return false;
}
}

Using WebClient:
private bool RemoteFileExistsUsingClient(string url)
{
bool result = false;
using (WebClient client = new WebClient())
{
try
{
    Stream stream = client.OpenRead(url);
    if (stream != null)
    {
           result = true;
    }
    else
    {
           result = false;
    }
}
catch
{
 result = false;
}
}
return result;
}

Call Method:
RemoteFileExistsUsingHTTP("http://localhost:16868/JavaScript1.js");

Don't confuse here as a result of it absolutely was implemented in 2 ways. continually use HttpWebRequest class over WebClient because of the following reasons:
1. WebClient internally calls HttpWebRequest
2. HttpWebRequest has a lot of options (credential, method) as compared to Webclient

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