Count letters in file

Proposed exercise

---

Create a program to count the amount of times that a certain character is inside a file (of any kind).

The file and the letter can be asked to the user or passed as parameters:

count example.txt a

It must display in screen the amount of letters found.

(you can choose any way to interact with the user, showing the proper help)

Output

---

Solution

---

using System;
using System.IO;

class CountLetters
{
static void Main()
{
bool debug = true;

Console.Write("Name of file: ");
string nameFile = Console.ReadLine();

Console.Write("Letter for count: ");
string letter = Console.ReadLine();

StreamReader myfile;
myfile = File.OpenText( nameFile );

string line;
int countLetter =0;
do
{
line = myfile.ReadLine();
if (line != null)
for (int i=0; i < line.Length; i++)
if (line.Substring(i,1) == letter)
countLetter++;
}
while (line != null);
myfile.Close();

Console.WriteLine("Amount of letter: {0}",countLetter);

if (debug)
Console.ReadLine();
}
}