Need to sort incoming external file before processing it

I have an external TXT file that contains over 3 milion records.  I need to process the file in my VB.Net program, and load a small portion of it into an SQLServer database.  I need to pre-sort the file before I start reading it.  It is too large to throw into an array and bubblesort.  Is there an external sort program that I can call (from VB.NET) to sort this file for me?  For you old-timers, think along the lines of the old mainframe sorts, where you simply tell the program what filename, columns, lengths, order, etc.

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Visual Basic.NET

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