How to add all numbers in txt file?

Question

C++ / C#

In WF, using textbox, I save several numbers in a txt file. How can I add them up and put the result into a string variable?

Answer 1

• Read text file
  
• Convert a string of numbers into an array of the desired type
  
• Add numbers
  

Answer 2

What exactly are you having trouble with?
Read file - File.ReadAllLines
Convert string to number to add - int.Parse or double.Parse, or any other Parse / TryParse. Well Convert in the end
Add in a loop or through Linq, I think you yourself will understand how
How to put the result in a variable, probably also clear