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Prevent incomplete file transfer over FTP using WinSCP .NET Assembly

I am simply trying to transfer text files from one FTP server to another using a windows service. I download the required files from source FTP server and save it locally on my system and then upload the saved file to the destination server. For downloading and uploading files I am using WinSCP .Net Assembly. Here is my code that I am using to transfer files to the destination server:
WinSCP.SessionOptions sessionOptions = new WinSCP.SessionOptions();
sessionOptions.Protocol = WinSCP.Protocol.Ftp;
sessionOptions.UserName = "myUsername";
sessionOptions.Password = "myPassword"
sessionOptions.PortNumber = 21;
sessionOptions.HostName = serverIPAddress;
session.Open(sessionOptions);
WinSCP.TransferOptions transferOptions = new WinSCP.TransferOptions();
transferOptions.TransferMode = WinSCP.TransferMode.Binary;
WinSCP.TransferOperationResult transferResult;
transferResult = session.PutFiles(PathToLocalFile + filename, destinationFilePath, false, transferOptions);
transferResult.Check();
It works fine and uploads file to the server, but in case a connectivity issue occurs while transferring the file, an incomplete chunk of required file is transferred to the destination server.
I have searched the WinSCP official documentation but I couldn't find anything related to this.
Is there any way to ensure that only complete files gets transferred to the destination otherwise (in case an error occurs during transfer), the transferred chunk of file gets deleted automatically? (Without manually deleting the incomplete file)

There no way to make this automatic.
You have to code it. Just check, if the transfer failed, reconnect (if needed), and delete the partially uploaded file.
Though as already mentioned in comments, if the transfer fails, because of problems with connection, you may not be able to reconnect to delete the file.
There's no magic solution. The server should be able to deal with partial files in the first place.
See also:
How to detect that a file is being uploaded over FTP (while seemingly different topic, detecting if file is being uploaded is basically the same thing, as detecting if file has not been uploaded completely)
File upload with WinSCP .NET/COM with temporary filenames

Could not find a part of the path error on file download

I've taken on an asp/c# web app to fix originally done by the previous developer at my workplace. The code shows a Gridview populated by results from a query showing a list of files, one column is made up of 'command fields' that when clicked download a file. Everything seems to go smoothly until it reaches the file download as it can't seem to find the file on the server. My C# really isn't strong so bear with me and if you need further info that I've missed out please do say so.
Here is the specific part of code that causes problems:
//strSuppDocName - is already declared elsewhere
string path = System.IO.Path.Combine(Server.MapPath("~/Documents/"), strSuppDocName);
if (!Directory.Exists(path)){
System.Windows.Forms.MessageBox.Show(path + " - file path doesn't exist");
}
else {
System.Net.WebClient client = new System.Net.WebClient();
Byte[] buffer = client.DownloadData(path);
if (buffer != null)
{
Response.ClearContent();
Response.ClearHeaders();
FileInfo file = new FileInfo(path);
Response.Clear();
Response.AddHeader("Content-Disposition", "Attachment;FileName:" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = ReturnExtension(strExtSuppDoc.ToLower());
Response.WriteFile(file.FullName);
Response.End();
}
}
What happens when I run the code is that the grid view populates okay, I click the file to download and it enters the first branch of the if statement showing the path. Before I added in the if statement it was showing the following error: "could not find a part of the path". I've tried fiddling with the path such as setting it absolutely:
string path = System.IO.Path.Combine(#"E:\web\Attestation\Documents\", strSuppDocName);
And without using the Combine method above and using standard string concatenation with '+'. Any help or guidance is most appreciated, thanks!

You're mixing a handful of technologies here. First of all, this doesn't belong in a web application:
System.Windows.Forms.MessageBox.Show(path + " - file path doesn't exist");
Web applications aren't Windows Forms applications. This won't display anything to someone using the web application, because there's no concept of a "message box" over HTTP.
More to the point, however, you're using path in two very different ways. Here:
Byte[] buffer = client.DownloadData(path);
and here:
FileInfo file = new FileInfo(path);
Is path a URL on the network or a file on the file system? It can't be both. The first line is treating it as a URL, trying to download it from a web server. The second line is treating it as a local file, trying to read it from the file system.
What is path and how are you looking to access it? If it's a URL, download it with the WebClient and stream it to the user. If it's a file, read it from the file system and stream it to the user. You can't do both at the same time.

If you are interacting with a path on a network (aka UNC path), you have to use Server.MapPath to turn a UNC path or virtual path into a physical path that .NET can understand. So anytime you're opening files, creating, updating and deleting files, opening directories and deleting directories on a network path, use Server.MapPath.
Example:
System.IO.Directory.CreateDirectory(Server.MapPath("\\server\path"));

The answer in short is that the file name was incorrect.
Strangely or mistakenly the author of the code, when uploading a given file, added an extra extension so a file would be something like 'image.png' to start off with then when uploaded would become image.png.png. Why didn't I notice this before you may ask? Simply because the whole path wasn't shown in Windows XP (don't ask why I was using XP) when viewing it through the explorer window and I dismissed this issue long before - a big mistake! After trying to find the file by typing the address of the file into the windows explorer address bar and receiving an error that the file doesn't exist, yet I could plainly see it did, a colleague looked at for the file remotely using Windows 7 and we saw that the file was shown as 'image.png.png'. Thereafter the path to the file worked correctly.

Word File savings without closing are Not Uploaded to the server

In my case, I want to build my own "drop box" like application which I am going to use as a part of my another project.
Discription:
When a word file is opened in the "drop box" folder(inside the folder where changes to the files, file creations deletions ect.. are identified). pictures, txts, txt updates are uploaded to the server without any issue.
But when it comes to office documents. office document creation is uploaded.
Problem:
when the word file is opened, and do some update and save it. the file can not be uploaded due to permission error. even the opened file can not be copied to another place and then uploaded.
Any one faced this kind of issue, and any sugessions.
But we can manually copy and save a opened and saved(but not closed) to another location
But in the program it is not allowed.

You can create another copy of file, this is important because uploading may be slower and reading shared file may lead to conflicts for Word, so what you can do is, you can create a copy quickly on temp file and upload the temp file.
string tmp = Path.GetTempFileName();
using(Stream s = new FileStream(filePath,
FileMode.Open, FileAccess.Read,
// following option will let you open
// opened file by other process
FileShare.ReadWrite)){
using(FileStream fs = File.OpenWrite(tmp)){
// this will copy file to tmp
s.CopyTo(fs);
}
}
// upload tmp file...

your problem is similar to what we faced. In our case we are all connected to a domain directory and the problem was the antivirus installed on our server gives read/write permissions to users (executing exe, installing apps). so you specifically need to give a user the right to execute an app that wants to use another app, in this case office docs.
The problem extended to asp apps using Crystal Reports. hope it helps.

How to create a Text file and save it to a shared-directory?

I'm having an issue here, I developed an application in C# which creates a text file. This text file is saved in the X:\Public\3rd\ASN\, the problem is that in development the files are created and saved with no issues but once I move the application into our Web Server the appplication fails and it throws out this error "Could not find a part of the path X:\Public\3rd\ASN\1175_0001.txt".
This is the code I'm using to saved the file in the directory:
w = File.CreateText("X:\Public\Public\3rd\ASN\1175ASN_0001.txt");
Keep in mind that this directory is another server.
Any help will be really appreciate it.

your X drive is a mapped network drive. You need to use the network url eg \\server\directory\Public\3rd\ASN\1175_0001.txt

C# System.Net WebClient.DownloadData - Error retrieving proper data

Perhaps the main issue is where I am uploading to - I am currently using MediaFire to upload my files. I have tested with downloading files of both ".exe" as well as ".png" formats; neither seem to work for me though.
The issue that is constantly occurring for me:
When I attempt to download a file, (I will put the URL's of the two files at the end of my question), the amount of data retrieved is either far greater - or far less than the actual size of the file. For example, I uploaded a blank VB6 executable file which is 16kb. The downloaded file comes out to be nearly 60 kilobytes!
Some things to note:
1) Both files download with no problems through Chrome (and I'm assuming other browsers as well).
2) I have tried multiple methods of retrieving the data from the downloaded file (same result).
My Code:
// Create a new instance of the System.Net 'WebClient'
System.Net.WebClient client = new System.Net.WebClient();
// Download URL
// PNG File
string url = #"http://www.mediafire.com/imageview.php?quickkey=a16mo8gm03fv1d9&thumb=4";
// EXE File (blank VB6 exe file # 16kb)
// string url = #"http://www.mediafire.com/download.php?nn1cupi7j5ia7cb";
// Destination
string savePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + #"\Test.png";
byte[] result = client.DownloadData(url);
MessageBox.Show(result.Length.ToString()); // Returns 57,000 something (over 3x larger than my EXE file!).
// Write downloaded data to desired destination
System.IO.File.WriteAllBytes(savePath, result);