This is a very basic program to calculate the quadratic equation.  It has a couple try catch blocks in case there is a divide by zero.  You enter the three variables (A, B, and C) and it will give you the two solutions.  If either or both cannot be determined it will list this also.

Download the VB.Net 2008 SP1 source code: code-quadraticequation.zip

Screen shot:

This source is released under the GPL.