Quote:why am I getting this error "Index and length must refer to a location within the string. Parameter name: length ".
The error message tells you that you try to substring outside of the string.
you forgot to check that line contain at least 1 char.
With the debugger, you can watch the program as it perform.
Your code do not behave the way you expect, and you don't understand why !
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia
Debugging C# Code in Visual Studio - YouTube
The debugger is here to only show you what your code is doing and your task is to compare with what it should do.