Int.Parse() Vs int.TryParse() Vs Convert.ToInt32() in c#.

Int.Parse() :- 

Int.Parse(string s) method converts the string to Integer. If string s is null then it will throw ArgumentNullException. If string s is other than integer value, then it will throw FormatException. If string s is out of rang integer, then it will throw OverFlowException.

Example:-

class Program 

    {

        static void Main(string[] args)

        {

          

            string val = "1000";

            string val1 = null;

            string val2 = "100.34";

            string val3 = "999999999999999999999";

            int res;

            res = int.Parse(val); // sucess

            res = int.Parse(val1); // ArgumentNullException

            res = int.Parse(val2); // FormatException

            res = int.Parse(val3); // OverFlowException

            Console.ReadKey();

        }

    }

int.TryParse :-

Int.TryParse(string s, out int result) method converts the string to Integer out variable and return true if successfully parsed. If string s is null then it will return 0. If string s is other integer value then out variable return 0 rather than FormatException. If string s is out of rang integer, then it will throw OverFlowException.

Example:-

class Program 

    {

        static void Main(string[] args)

        {

          

            string val = "1000";

            string val1 = null;

            string val2 = "100.34";

            string val3 = "999999999999999999999";

            bool finalRes;

            int res;

            finalRes = int.TryParse(val, out res); // sucess

            finalRes = int.TryParse(val1,out res); // 0

            finalRes = int.TryParse(val2,out res); // 0

            finalRes = int.TryParse(val3,out res); // 0

            Console.ReadKey();

        }

    }

 Convert.ToInt32():-

Int.Parse(string s) method converts the string to Integer. If string s is null then it will return 0. If string s is other than integer value, then it will throw FormatException. If string s is out of rang integer, then it will throw OverFlowException.

Example:-

class Program 

    {

        static void Main(string[] args)

        {

          

            string val = "1000";

            string val1 = null;

            string val2 = "100.34";

            string val3 = "999999999999999999999";

            int res;

            res = Convert.ToInt32(val); // sucess

            res = Convert.ToInt32(val1); // 0

            res = Convert.ToInt32(val2); // FormatException

            res = Convert.ToInt32(val3); // OverFlowException

            Console.ReadKey();

        }

    }