To implement a progress bar, you cannot simply call a single "download" method. Instead, you must manually read the data in chunks and update your UI as each chunk is received.
Download file from FTP with Progress - TotalBytesToReceive is always
Before starting the download, send a request to the server to find out how large the file is. This value will be the Maximum property of your ProgressBar . c# ftpwebrequest download file progress bar
To keep the UI responsive and update the progress bar, you must read from the FTP stream in small buffers (e.g., 10 KB or 32 KB).
The Challenge: Why FtpWebRequest Doesn't Have a "Progress" Event To implement a progress bar, you cannot simply
long GetFtpFileSize(string uri, NetworkCredential credentials) { var request = (FtpWebRequest)WebRequest.Create(uri); request.Method = WebRequestMethods.Ftp.GetFileSize; request.Credentials = credentials; using (var response = (FtpWebResponse)request.GetResponse()) { return response.ContentLength; } } Use code with caution. 2. Download the File in Chunks
How to Download a File via FtpWebRequest with a Progress Bar in C# This value will be the Maximum property of your ProgressBar
Unlike some high-level libraries, FtpWebRequest does not provide a built-in event like DownloadProgressChanged . Furthermore, a standard FTP response stream often does not tell you the total file size upfront.