SWITCH....CASE statement in C#

The switch statement is a control statement that handles multiple selections by passing control to one of the case statements within its body.

This kind of statements are used to pass the control of the process to a specified execution statements whose constant value matches the condition expression, i.e., the Control is transferred to the case statement whose constant-expression matches expression. The switch statement can include any number of case instances, but no two case constants within the same switch statement can have the same value. Execution of the statement body begins at the selected statement and proceeds until the jump-statement transfers control out of the case body.

switch (expression)
{
case constant-expression:
statement
jump-statement
[default:
statement
jump-statement]
}

Code:

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using System;
class SwitchTest
{
    public static void Main()   
    {
    Console.WriteLine("Coffee sizes: 1=Small 2=Medium 3=Large");
    Console.Write("Please enter your selection: ");
    string s = Console.ReadLine();
    int n = int.Parse(s);
    int cost = 0;
    switch(n)
    {
    case 1:
        cost += 25;
        break;
    case 2:
        cost += 25;
        goto case 1;
    case 3:
        cost += 50;
        goto case 1;
    default:   
        Console.WriteLine("Invalid selection. Please select 1, 2, or 3.");
        break;
      }
    if (cost != 0) 
        Console.WriteLine("Please insert {0} cents.", cost);
        Console.WriteLine("Thank you for your business.");
    } 
}

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C# has a switch statement just like the one found in C/C++ and Java. But the C# switch has an important difference: it does not allow fall-through between cases.