imple class to read and write .txt file to hastable and do the inverse

This project must be done on Visual Studio 2008 using c#. I need a class that can do: - Read a .txt file to an hastable - Write a .txt file from a hastable - order the hastable by the first value - it should work independently of the number of fields or dolumns. - if the .txt file already exists it should rewrite it. - It can be possible define the name and location of the .txt file or read it from a previous location and name.