This kind of applications is my hobby, I used to do much tougher applications with lots of validation for the input and in multi-language.
My bid is below the average as I am still a new, but I assure my concern is you satisfaction, I am flexible if u need more modification for 5 stars feedback (free if small modifications), I am expert in c# for these tasks.
Also, if you would like a demo for the app before accepting me, just let me know and I will send it.
One last thing to mention, I am good and fast to develop such tasks, but I also do it with quality to ensure adding new features easily, in the future, as the only constant in software development is "CHANGE".
Cheers,
Bassel Safwat