title: Control cannot fall through from one case label to another C#
body: <p>Hi what have I done wrong, I'm getting the error "Control cannot fall through from one case label to another" at line 15 (Switch (z))</p>
  
  <pre><code>   using System; 
     namespace test
     {
      class MainClass
       {
       public static void Main (string[] args)
       {
          Console.WriteLine ("Velkommen til pCalc! Vælg hvad du skal I menuen:");
          Console.WriteLine ("1. Phythagoras");
          Console.WriteLine ("2. Cirklens areal og omkreds");
          Console.WriteLine ("3. + - * eller /");
  
          int z = Convert.ToInt32(Console.ReadLine());
          switch (z)
          {
          case 1:
              Console.WriteLine ("Her skal du angive 2 værdier, a og b for at beregne c");
              Console.WriteLine ("Skriv a værdien: ");
              double a = double.Parse (Console.ReadLine ());
              Console.Clear ();
              Console.WriteLine ("Skriv værdien for b: ");
              double b = double.Parse (Console.ReadLine ());
              Console.Clear ();
              Console.WriteLine (Math.Sqrt((Math.Pow(a, 2))+(Math.Pow(b, 2))));
              break;
  
          case 2:
          Console.WriteLine ("Skriv radius a cirklen: ");
          double r = double.Parse (Console.ReadLine ());
          double areal = (Math.Pow (r, 2) * Math.PI);
          Console.Clear ();
          Console.WriteLine (areal);
          Console.WriteLine ("Vil du også vide omkredsen? Skriv 1 for Ja, 2 for Nej");
          int q = Convert.ToInt32 (Console.ReadLine ());
          switch (q) {
          case 1:
              Console.WriteLine (r * 2 * Math.PI);
              break;
          case 2:     
              break;
          }
          }   
      }
  }
  </code></pre>
  
  <p>}           </p>