copy a file on remote location

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C#

hi I am trying to create a win based application in C#.Net which will copy a text file on the remote location (ftp server) from my file system.
But I am not able to figure out how. It is obvious that I would need to do the authentication to the remote server . But Dont know how to do the authentication to that remote location and copy a file over there.

If anyone knows anything which will help me please reply.