Simple Arduino Upload Application in C++

I need some one to write very simple code using C#. The Application needs to do: 1. Upload .Hex Files to the Arduino - must detect the port where arduino is connected. Here is a quick tutorial and sample code for uploading a hex file to arduino using c#" [login to view URL] 2. Been able to update the flash memory: Already have a sample code but has some bugs. All you need to do is to finish it. This job can be done quick for someone that has experience. Unfortunately I know how to do it, but I don't have time to focus on this. Please bid low, because this is easy!!!!!