Uppercase Consonants in C#

 A simple program that will ask the user to give a string and then the program will uppercase the consonants in a given string using C# programming language.

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Program Listing
Program.cs
using System;

public class Program
{
  public static void Main()
  {
    Console.Write("\n");
    Console.Write("\tUppercase Consonants in C#");
    Console.Write("\n\n");
    Console.Write("\tEnter a string: ");
    string input = Console.ReadLine();

    Console.Write("\n\n");
    Console.Write("\tGiven String : " + input);
    Console.Write("\n\n");
    Console.Write("\tThe Result: ");
    foreach (char ch in input)
    {
      PrintChar(ch);
    }

    Console.Write("\n\n");
    Console.Write("\tEnd of Program");
    Console.Write("\n");
    Console.ReadKey();
  }
     
  public static void PrintChar(char ch)
  {
    ConsoleColor old_color = Console.ForegroundColor;

    if (ch.IsConsonant())
    {

      Console.ForegroundColor = ConsoleColor.Yellow;
      Console.Write(Char.ToUpper(ch));
      Console.ForegroundColor = old_color;
    }
    else
      Console.Write(ch);
  }
}


Characterextensions.cs
using System;

public static class CharacterExtensions
{
  public static bool IsConsonant(this char ch)
  {
    const string consonants = "BCDFGHJKLMNPQRSTVWXYZ";

    return consonants.IndexOf(Char.ToUpper(ch)) != -1;
  }
}