Reference variable from a different method, class, file

Question

I need to reference the value of a variable in a different method, class, and file than the one I am currently in. I am brand new to C# and still trying to get these concepts.

Answer 1

Short answer: you can't, period.

What you can do is set a public member variable:

namespace Planning
{
    public class Service
    {
        public bool variable;

        public bool AddRoute(l, m, n)
        { 
            variable = xyz;
        }
    }
}

But public member variables are frowned-upon, with good reason.

Better yet, add a read-only property that returns the value of a private member variable:

namespace Planning
{
    public class Service
    {
        private bool variable;

        public bool Variable
        {
          get 
          {
            return variable;
          }
        }

        public bool AddRoute(l, m, n)
        { 
            variable = xyz;
        }
    }
}

Then from elsewhere:

Planning.Service myObj = new Planning.Service();
myObj.AddRoute(1,2,3);

if (myObj.Variable)
{
  // ...
}