c# ftp code

using this code to upload to ftp but getting error:
c:/soapmessages/OUT/20170421_xxxx.csv
System.UriFormatException: Invalid URI: The format of the URI could not be deter
mined.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
   at System.Uri..ctor(String uriString)
   at System.Net.WebRequest.Create(String requestUriString)
   at MYPROGRAM.Program.Main(String[] args) in J:\mastersource\MYPROGRAM\ConsoleApplication2\Program.cs:line 161
Press any key to exit.

fileName = "c:/soapmessages/OUT/" + var_yr + var_mth + var_day + "_xxxx.csv";
ftpFile = "ftp://" + ftpServerIP;
string ftpfullpath = Path.GetFileName(ftpFile);
FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);      [b]<----- line 161[/b]
ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
ftp.KeepAlive = true;
ftp.UseBinary = true;
ftp.Method = WebRequestMethods.Ftp.UploadFile;

FileStream fs = File.OpenRead(fileName);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();

Stream ftpstream = ftp.GetRequestStream();
ftpstream.Write(buffer, 0, buffer.Length);
ftpstream.Close();

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