My Solution

using System;
using System.Text;

namespace taesooya
{
    class test
    {
        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder();
            int T = int.Parse(Console.ReadLine());
            string[] ss;

            for (int i = 1; i <= T; i++)
            {
                ss = Console.ReadLine().Split();
                int sum = int.Parse(ss[0]) + int.Parse(ss[1]);
                sb.Append("Case #" + i + ": " + sum + "\\n");
            }
            Console.WriteLine(sb);
        }
    }
}

using System;
using System.Text;

namespace taesooya
{
    class test
    {
        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder();
            int T = int.Parse(Console.ReadLine());
            string[] ss;

            for (int i = 1; i <= T; i++)
            {
                ss = Console.ReadLine().Split();
                int sum = int.Parse(ss[0]) + int.Parse(ss[1]);
                sb.Append("Case #" + i + ": " + int.Parse(ss[0]) + " + " + int.Parse(ss[1]) + " = " + sum + "\\n");
            }
            Console.WriteLine(sb);
        }
    }
}