Upload Binary image from database to FTP folder using C#

i have used some code to upload an Image to my web server folder using FTP.its working fine when i enter ftp url,username,password and file path, but i need to upload this image without file path like i have a byte array and i have converted that bytes to image and want upload in server folder.but it requires file path.

how can i upload my image without file path. 

using (System.Net.WebClient client = new System.Net.WebClient())
            {
                client.Credentials = new System.Net.NetworkCredential(userName, password);
                client.UploadFile(ftpServer + "/" + new FileInfo(filename).Name, "STOR", filename);
                
            }