1- This line doesn't make since, if it's a method give it a return type
Code:
public indearcalc()
2- you are call leer_opciones(); which doesn't exist in your code
3- openCommand & optionsCommand doesn't exist in your class
4- You have 2 definitions of [private void menu()] and [public void startApp()]. You can't do that in OOP
"I'm not normally a praying man, but if you're up there, save me... Superman!" - Homer Simpson My Blog
After looking over your code, I agree with ComputerJy also you have put all your code into one place onstead of have several smaller pieces of code that get called form each other or the main form.