number of occurrences of a character in a string in c#

Below programs shows number of occurrences of a character in a string.

class NoOfTimesLetterAppearedInString
{
    public static void Main()
    {
        char letterToFind = 'r';
        string sentence = "dotnetmirror reflects your knowledge";
        int count = GetLetterCountInSentence(letterToFind, sentence);
        Console.WriteLine("letter {0} found {1} Times in '{2}'", letterToFind, count, sentence);
        Console.ReadLine();
    }
    public static int GetLetterCountInSentence(char letter, string sentence2check)
    {
        int noOfTimes = 0;
        for (int i = 0; i < sentence2check.Length; i++)
        {
            if (sentence2check[i] == letter)//if found, increase the count
            {
                noOfTimes += 1;
            }
        }
        return noOfTimes; //returns the count of noOfTimes
    }
}

Output: