ftp - Invalid Uri: invalid port specified C# -

i created ftp server locally filezilla server. admin port 14147 default. filezilla client got connected no problems.

when try connect chrome or ie

ftp://(ip) 

or

ftp://(full machine name)  

or

ftp://(user:password)@(machine).  

everything ok.

my admin interface setting port 14147. listing port default 21

no problems @ internet browsers telnet.

now created application in c# , when use uri class

uri target = new uri(struri); 

i got exception error: invalid uri: invalid port specified

i saved ftp address in database , tried many variations nothing happens:

ftp://user:password@fullmachinenamewithdomain ftp://user:password@fullmachinenamewithdomain:21 ftp://user:password@fullmachinenamewithdomain:14147 

what doing wrong?

afaik username , password not supposed part of url. should pass them separately credentials when you're using ftpwebrequest class. e.g.

request.credentials = new networkcredential(username, password);