Program.cs
 

using System;

namespace MyApplication
{
  class Program
  {
    static void Main(string[] args)
    {
      int day = 4;
      switch (day) 
      {
        case 1:
          Console.WriteLine("Monday");
          break;
        case 2:
          Console.WriteLine("Tuesday");
          break;
        case 3:
          Console.WriteLine("Wednesday");
          break;
        case 4:
          Console.WriteLine("Thursday");
          break;
        case 5:
          Console.WriteLine("Friday");
          break;
        case 6:
          Console.WriteLine("Saturday");
          break;
        case 7:
          Console.WriteLine("Sunday");
          break;
      }    
    }
  }
}

Result:
Thursday