Why ins't inlining working here?

class Program
{
    static void Main(string[] args)
    {
        int k = DoFoo(10, 20);
    }
    
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    static int DoFoo(int i, int b)
    {
        return i + b;
    }
}

class Program
{
    static void Main(string[] args)
    {
        int k = DoFoo(10, 20);
    }
    
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    static int DoFoo(int i, int b)
    {
        return i + b;
    }
}