[C#] Download File Supporting Resume

Simple function in C# that allows to download a file from the internet and supports to resume the download, using HttpWebRequest/HttpWebResponse and FileStream

public static void downloadFile(string sourceURL, string destinationPath)
long fileSize = 0;
int bufferSize = 1024;
bufferSize *= 1000;
long existLen = 0;
System.IO.FileStream saveFileStream;
if (System.IO.File.Exists(destinationPath))
System.IO.FileInfo destinationFileInfo = new System.IO.FileInfo(destinationPath);
existLen = destinationFileInfo.Length;
if (existLen > 0)
saveFileStream = new System.IO.FileStream(destinationPath,
saveFileStream = new System.IO.FileStream(destinationPath,
System.Net.HttpWebRequest httpReq;
System.Net.HttpWebResponse httpRes;
httpReq = (System.Net.HttpWebRequest) System.Net.HttpWebRequest.Create(sourceURL);
httpReq.AddRange((int) existLen);
System.IO.Stream resStream;
httpRes = (System.Net.HttpWebResponse) httpReq.GetResponse();
resStream = httpRes.GetResponseStream();
fileSize = httpRes.ContentLength;
int byteSize;
byte[] downBuffer = new byte[bufferSize];
while ((byteSize = resStream.Read(downBuffer, 0, downBuffer.Length)) > 0)
saveFileStream.Write(downBuffer, 0, byteSize);
view raw DownloadFile.cs hosted with ❤ by GitHub

What about you, how do you downloading files using C# ?

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