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using System;
public class InvalidAgeException : Exception
{
public InvalidAgeException(string message) : base(message)
{
}
}
class Program
{
static void ValidateAge(int age)
{
if (age < 18)
{
throw new InvalidAgeException("Age must be 18 or above.");
}
Console.WriteLine("Valid Age");
}
static void Main()
{
try
{
ValidateAge(15);
}
catch (InvalidAgeException ex)
{
Console.WriteLine("Custom Error: " + ex.Message);
}
}
}Coding works best on desktop or with an external keyboard.