“Method must have a return type” and “a return keyword must not be followed by an object expression” errors

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There are two ways the class could work… static or instanced.

Instanced

If you want the main method to work this way….

Addition addi = new Addition();
Console.WriteLine("The answer of both {0} and {1} is {2}", num1, num2, addi);

then your Addition class should be more like this:

class Addition
(
    private readonly int result;

    public Addition(int num1, int num2)
    {
        result = num1 + num2;
    }

    public override string ToString()
    {
        return result.ToString();
    }
}

Then it will work with a small change:

Addition addi = new Addition(num1, num2);  //Have to pass the values in
Console.WriteLine("The answer of both {0} and {1} is {2}", num1, num2, addi);

Static

A static method requires no instance, so you have to change this:

Addition addi = new Addition();  
Console.WriteLine("The answer of both {0} and {1} is {2}", num1, num2, addi);

To this:

var addi = Addition.Add(num1, num2);
Console.WriteLine("The answer of both {0} and {1} is {2}", num1, num2, addi);

And your class should look like this:

static class Addition
{
    static public int Add(int num1, int num2)
    {
        return num1 + num2;
    }
}

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