New window to save and retieve a string to a text file

This project is for the development of a new window that will allow user to enter a REGEX expression into a text box, save the entered string to a text file or retrieve an existing REGEX expression from the text file. This is a very simple project that performs the following functions: 1. Allow user enter a regex text string into a textbox. 2. Allow user to view a list of regex text strings and retreive from a text file. 3. Allow user to delete an existing regex text string from a text file. 4. Allow user to append new regex strings to the text file. 5. Create the text file and specified path if it does not exist. 6. The text file consists of 3 columns separted by a I (pipe). 7. User will be able sort the viewable list of existing text strings. Additional details are provided in the attached specification. Project must be developed in C# using visual studio 2005 or greater. Project must be unit tested. All code must be delivered before final payment.