Create a console menu system in CSharp

using System;  //  w ww . j  av a2s. com
  
public class MainClass {  
  public static void Main() {  
    char choice;  
  
    for(;;) {  
      do {  
        Console.WriteLine("Help on:");  
        Console.WriteLine("  1. if");  
        Console.WriteLine("  2. switch");  
        Console.WriteLine("  3. for");  
        Console.WriteLine("  4. while");  
        Console.WriteLine("  5. do-while");  
        Console.WriteLine("  6. break");  
        Console.WriteLine("  7. continue");  
        Console.WriteLine("  8. goto\n");  
        Console.Write("Choose one (q to quit): ");  
        do {  
          choice = (char) Console.Read();  
        } while(choice == '\n' | choice == '\r');      
      } while( choice < '1' | choice > '8' & choice != 'q');  
  
      if(choice == 'q') break;  
  
      Console.WriteLine("\n");  
   
      switch(choice) {  
        case '1':  
          Console.WriteLine("The if:\n");  
          Console.WriteLine("if(condition) statement;");  
          Console.WriteLine("else statement;");  
          break;  
        case '2':  
          Console.WriteLine("The switch:\n");  
          Console.WriteLine("switch(expression) {");  
          Console.WriteLine("  case constant:");  
          Console.WriteLine("    statement sequence");  
          Console.WriteLine("    break;");  
          Console.WriteLine("  // ...");  
          Console.WriteLine("}");  
          break;  
        case '3':  
          Console.WriteLine("The for:\n");  
          Console.Write("for(init; condition; iteration)");  
          Console.WriteLine(" statement;");  
          break;  
        case '4':  
          Console.WriteLine("The while:\n");  
          Console.WriteLine("while(condition) statement;");  
          break;  
        case '5':  
          Console.WriteLine("The do-while:\n");  
          Console.WriteLine("do {");  
          Console.WriteLine("  statement;");  
          Console.WriteLine("} while (condition);");  
          break;  
        case '6':  
          Console.WriteLine("The break:\n");  
          Console.WriteLine("break;");  
          break;  
        case '7':  
          Console.WriteLine("The continue:\n");  
          Console.WriteLine("continue;");  
          break;  
        case '8':  
          Console.WriteLine("The goto:\n");  
          Console.WriteLine("goto label;");  
          break;  
      }  
      Console.WriteLine();  
    }  
  }  
}