Help Me/Question Required Help In Downloading Files Using C#

I could not understand your question completely, please elaborate what you actually need. Share the code and we might be able to help you better. From what I understand, you need the below mentioned stuff to work. I've included the links which can actually help you to understand it.

1) Get HTTP File Size using C# Get http:/.../File Size
2) Actually download the file: How to download a file from a URL in C#?
3) Implementing Progress Bar: How do I implement a progress bar in C#?

To understand the basic concepts of C#, take a look at Microsoft's documentation: Classes (C# Programming Guide)

Let me know if you still have any doubts, preferably with some sort of code so that we know what you're doing wrong.

 

Hello @krishatg, seems you may want to check the "Last-Modified" header against your local file's last write time.

Perhaps you can adapt something like this:

Code:

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// Set local file
string localFile = "your-local-file.ext";
 
// Set remote file URI
Uri remoteFileUri = new Uri("http://your-site.com/your-remote-file.ext");
 
// Get local file DateTime
DateTime localFileDateTime = new FileInfo(localFile).LastWriteTime;
 
// Set HTTP web request
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(remoteFileUri);
 
// Set method to head
httpWebRequest.Method = "HEAD";
 
// Set HTTP web response
HttpWebResponse httpWebResponse = (HttpWebResponse)(httpWebRequest.GetResponse());
 
// Get last modified datetime
DateTime remoteFileDateTime = httpWebResponse.LastModified;
 
// Compare both dates
if(DateTime.Compare(localFileDateTime, remoteFileDateTime) < 0)
{
	// Use a new web client
	using(WebClient webClient = new WebClient())
	{
		// Download asynchronously to avoid locking current thread
		webClient.DownloadFileAsync(remoteFileUri, localFile);
	}
}
 
// Close HTTP web response
httpWebResponse.Close();

Also, remember to add the directives:

Code:

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using System.Net;
using System.IO;

Hope it helps.