Ok, so I already can upload a file to an FTP server: How to upload a file to an FTP server using C#?

However, now I need to create a directory first.

It follows some basic steps:

1. Open a request using the full destination ftp path: Ftp://Ftp.Server.tld/ or Ftp://Ftp.Server.tld/Some/Path
2. Configure the connection request
3. Call GetResponse() method to actually attempt to create the directory
4. Verify that it worked.

See the steps inside the source as comments:

using System;
using System.IO;
using System.Net;

namespace CreateDirectoryOnFtpServer
{
    class Program
    {
        static void Main(string[] args)
        {
            CreateDirectoryOnFTP("ftp://ftp.server.tld", /*user*/"User1", /*pw*/"Passwd!", "NewDirectory");

        }

        static void CreateDirectoryOnFTP(String inFTPServerAndPath, String inUsername, String inPassword, String inNewDirectory)
        {
            // Step 1 - Open a request using the full URI, ftp://ftp.server.tld/path/file.ext
            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(inFTPServerAndPath + "/" + inNewDirectory);

            // Step 2 - Configure the connection request
            request.Credentials = new NetworkCredential(inUsername, inPassword);
            request.UsePassive = true;
            request.UseBinary = true;
            request.KeepAlive = false;

            request.Method = WebRequestMethods.Ftp.MakeDirectory;

            // Step 3 - Call GetResponse() method to actually attempt to create the directory
            FtpWebResponse makeDirectoryResponse = (FtpWebResponse)request.GetResponse();
        }
    }
}

All right, now you have created a directory on the FTP server.

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