Int, Double and String

using System;

namespace IntDoubleString
{
    class IntDoubleString
    {
        static void Main()
        {
            decimal InputType;
            Console.WriteLine("Please choose a type: \n1 --> int \n2 --> double \n3 --> string: ");
            while (!decimal.TryParse(Console.ReadLine(), out InputType) || (InputType != 1 && InputType != 2 && InputType !=3 ))  // using VAR TYPE Decimal and the OR (input !=#) to make sure that only 1,2 AND 3 are accepted as proper input, otherwise prompts again.
            {
                Console.WriteLine("Please enter proper integer: ");
            }
            switch ((int)InputType)
            {
                case 1:
                    int CaseInt;
                    Console.WriteLine("Please enter a integer: ");
                    while (!int.TryParse(Console.ReadLine(), out CaseInt)) //gotta make sure that a proper integer is entered.
                {
                    Console.WriteLine("Please enter proper integer: ");
                }
                    Console.WriteLine("{0}", CaseInt+1);
                    break;

                case 2:
                    double CaseDouble;
                    Console.WriteLine("Please enter a double: ");
                    while (!double.TryParse(Console.ReadLine(), out CaseDouble))
                {
                    Console.WriteLine("Please enter proper double: ");
                }
                    Console.WriteLine("{0}", CaseDouble+1.00);
                    break;

                case 3:
                    Console.WriteLine("Please enter a string: ");
                    string CaseString = Console.ReadLine();
                    Console.WriteLine("{0}", CaseString+"*"); //because it is a string, i do not know of a way to break somehow the input. even an empty input on String type outputs *.
                    break;

                default: Console.WriteLine("Wrong input"); //not really needed, but just in case if you manage somehow to break the program and manage to escape from all other cases and statements.
                    break;
            }
        }
    }
}