Anyone have issues with C# methods challenge: https://teamtreehouse.com/library/c-objects/methods/method-overloading

There is nothing technically wrong with the code itself, but you have not followed the instructions that the task specified. The error message that pops up when running your code is actually pretty straightforward:

Did you alter the original EatFly method instead of creating a new one?

It is pointing out that you have altered the original EatFly method, which you are not meant to do. The instructions specify that you are to add a new EatFly method that takes two parameters, it does not ask you to modify the existing EatFly method.

If you keep the original EatFly method around and just add your method below it like this:

namespace Treehouse.CodeChallenges
{
    class Frog
    {
        public readonly int TongueLength;
        public readonly int ReactionTime;

        public Frog(int tongueLength, int reactionTime)
        {
            TongueLength = tongueLength;
            ReactionTime = reactionTime;
        }

        public bool EatFly(int distanceToFly)
        {
            return TongueLength >= distanceToFly;
        }

        public bool EatFly(int distanceToFly, int flyReactionTime)
        {
            return TongueLength >= distanceToFly && ReactionTime <= flyReactionTime;
        }
    }
}

Then you'll be able to pass the challenge.