User Choice To Enter Int/Double/String And Do Actions

using System;
class UserChoiceToEnterIntOrDoubleOrStringAndDoActions
{
  static void Main()
  {
    //Write a program that, depending on the user's choice inputs int, double or string variable. If the variable is integer or double, increases it with 1. If the variable is string, appends "*" at its end. The program must show the value of that variable as a console output. Use switch statement.

    Console.Write("Please choose what type of variable you want to enter.\n 1 : Integer\n 2 : Double\n 3 : String\nEnter your choice 1, 2 or 3 here: ");
    byte choice = byte.Parse(Console.ReadLine());
    Console.Write("Please enter your variable:");
    string userinput = Console.ReadLine();

    switch (choice)
    {
      case 1:
        {
          int integerVar = int.Parse(userinput);
          integerVar += 1;
          Console.WriteLine("The increased value of your number is: {0}", integerVar);
        }
        break;
      case 2:
        {
          double doubleVar = double.Parse(userinput);
          doubleVar += 1;
          Console.WriteLine("The increased value of your number is: {0}", doubleVar);
        }
        break;
      case 3:
          userinput += "*";
          Console.WriteLine("The new value of your string is: {0}", userinput);
        break;
      default: Console.WriteLine("Wrong input!");
        break;
    }
  }
}