Save attachment file of a record to server ( C#)

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Delphi

Hi I write a database software by C#. DB is SQL Server and has install on server . User save record to bank. For every record there is an attachment file which must be save in server. File must be save in a folder in server and it’s Address must be save in bank. For save file to folder in server, there must be a login of windows which has full access to that folder.
In Delphi how can I use this login (username and password) in my code?
Please reply me full commands for do this work.
Thanks very much