using System;

public class Program

{

    public static void Main()

    {

        //Strings

        //string method

        //convert a string to number

        //convert a number to string

        //Formating: ToLower() ToUpper() Trim()

        //Searching: IndexOf('a') LastIndexOf("Hello")

        //substring: substring(startIndex) substring(startIndex, length)

        //Null Checking: String.IsNullOrEmpty(str) String.IsNullOrWhiteSpace(str)

        //Splitting:str.SPlit(' ')

        //Convertinf String to Numbers: string s = "1234"; int i = int.Parse(s); int j = Convert.ToInt32(s);

        //COnverting Numbers to string: int i = 1234; string s = i.ToString(); string t = i.ToString("C") // 1,234.00; string t = i.ToString("C0"); //1,234

        var fullName = "Mosh Hamedani ";

        Console.WriteLine("Trim: '{0}'", fullName.Trim());

        Console.WriteLine("ToUpper: '{0}'", fullName.ToUpper());

        var index = fullName.IndexOf(' ');

        var firstName = fullName.Substring(0,index);

        var lastName = fullName.Substring(index+1);

        Console.WriteLine("FirstName:" + firstName);

        Console.WriteLine("FirstName:" + lastName);

        var names = fullName.Split(' ');//will return to array not list!

        Console.WriteLine("FirstName:" + names[0]);

        Console.WriteLine("lastName:" + names[1]);

        Console.WriteLine(fullName.Replace("Mosh", "Moshfegh"));

        if (String.IsNullOrWhiteSpace(" "))

            Console.WriteLine("Invalid");

        var str = "25";

        var age = Convert.ToByte(str);

        Console.WriteLine(age);

        float price = 29.85f;

        Console.WriteLine(price.ToString("C0"));

​

    }

}