http://msdn.microsoft.com/en-us/library/ms162802.aspx

BCP is a command line utility used to transfer data from SQL to text files. It is supported by SQL and the exe is located in the BIN folder on the SQL server. There are many on-line support sites where others have developed processes using bcp. I think you should be able to use it with C#, but for fixed-length, you may need a format file (layout). Hope this helps.