Error when calling a function in C# because variable is used in parameter

Question

I'm new to c#, but I'm trying to create a basic program that can use a function that adds to numbers (this is just practice I know it's inefficient.

        {
            int AddNumbers(int num1, int num2) //Here's where the error comes
            {
                int result = num1 + num2;
                return result;
            }

            int num1 = 10;

            int num2 = 20;

            AddNumbers(num1, num2);

However, when I try it, it says that "A local parameter named 'num1' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter". I assume that this is because I declared the variables while calling the function, but I don't know how to fix it.

Thanks for any help!

EDIT: Just to be clear, the numbers after the functions are the number I would like to be added in the function

Answer 1

Welcome to SO.

as you know you cannot have same variable name used in a method here is what you need

     {
        int AddNumbers(int num1, int num2) //Here's where the error comes
        {
            int result = num1 + num2;
            return result;
        }

        int num2 = 10;

        int num3 = 20;

        AddNumbers(num2, num3);

    }

you can have something like this:

class Program
{
    int p = 0;
  public  static void Main(string[] args)
    {
        int num1 = 10;
        int num2 = 20;           
     int num =  Method1(num1,num2);
     Console.WriteLine(num);
    }

    public static int Method1(int num1, int num2)
    {
        p = num1 + num2;
        return p;
    }      
}