public static void Main()
string correctInput = "111";
int x = int.Parse(correctInput);
string incorrectInput = "aaa";
bool isIntA = int.TryParse(correctInput, out result);
bool isIntB = int.TryParse(incorrectInput, out result);;
IncrementRef(ref testInt);
Console.WriteLine(testInt);
public static void IncrementRef(ref int x)
public static void Increment(int x)