Ways to count the occurrences of character 'g' in the string "debugging"

countG.cs

///////////////////////////////////////////
// Method #1
// Uses a for loop and substring
///////////////////////////////////////////

int letterCount = 0;
string strText = "Debugging";
string letter;

for (int i = 0; i < strText.Length; i++)
{
	letter = strText.Substring(i,1);
	
	if (letter == "g")
	{
		letterCount++;
	}
}

string message = "g appears " + letterCount + " times";

///////////////////////////////////////////
// Method #2
// Uses a for loop and character index
///////////////////////////////////////////

int letterCount = 0;
string strText = "Debugging";
char letter;

for (int i = 0; i < strText.Length; i++)
{
	letter = strText[i];
	
	if (letter == 'g')
	{
		letterCount++;
	}
}

string message = "g appears " + letterCount + " times";

///////////////////////////////////////////
// Method #3
// Uses a foreach loop
///////////////////////////////////////////

int letterCount = 0;
string strText = "Debugging";

foreach (char letter in strText)
{
	if (letter == 'g')
	{
		letterCount++;
	}
}

string message = "g appears " + letterCount + " times";

///////////////////////////////////////////
// Method #4
// Uses the count extension method and
// a lambda expression
///////////////////////////////////////////

int count = "Debugging".Count(c => c == 'g');
string message = "g appears " + count + " times";