(http://csharppad.com/gist/1f55434dd3e4523942a63d8c225197a2)

file.cs

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using System.Text;
namespace string_function
{
    class Program
    {
        static void Main(string[] args)
        {
            string firstname;
            string lastname;
           
           
            firstname = "Steven Clark";
            lastname = "Clark";
            var abc=firstname.Split('.').ElementAt(0).ToUpper();
 
  Console.WriteLine(firstname);
   Console.WriteLine("-----------------");
   Console.WriteLine(abc);
// Make String Clone
            Console.WriteLine(firstname.CompareTo(lastname));
//Compare two string value and returns 0 for true and
1 for false

 Console.WriteLine(firstname.Contains("ven")); //Check whether specified value exists or not in string

  Console.WriteLine(firstname.EndsWith("n")); //Check whether specified value is the last character of string
            Console.WriteLine(firstname.Equals(lastname));
//Compare two string and returns true and false


  Console.WriteLine(firstname.GetHashCode());
//Returns HashCode of String

  Console.WriteLine(firstname.GetType());
//Returns type of string

  Console.WriteLine(firstname.GetTypeCode());
//Returns type of string

  Console.WriteLine(firstname.IndexOf("e")); //Returns the first index position of specified value
the first index position of specified value

  Console.WriteLine(firstname.ToLower());
//Covert string into lower case

  Console.WriteLine(firstname.ToUpper());
//Convert string into Upper case

  Console.WriteLine(firstname.Insert(0, "Hello")); //Insert substring into string

  Console.WriteLine(firstname.IsNormalized());
//Check Whether string is in Unicode normalization
from C


   Console.WriteLine(firstname.LastIndexOf("e")); //Returns the last index position of specified value

 Console.WriteLine(firstname.Length);
//Returns the Length of String

 Console.WriteLine(firstname.Remove(5));
//Deletes all the characters from begining to specified index.

 Console.WriteLine(firstname.Replace('e','i')); // Replace the character
 
  string[] split = firstname.Split(new char[] { 'e' }); //Split the string based on specified value


            Console.WriteLine(split[0]);
            Console.WriteLine(split[1]);
            Console.WriteLine(split[2]);
 
  Console.WriteLine(firstname.StartsWith("S")); //Check wheter first character of string is same as specified value

  Console.WriteLine(firstname.Substring(2,5));
//Returns substring

  Console.WriteLine(firstname.ToCharArray());
//Converts an string into char array.

  Console.WriteLine(firstname.Trim());
//It removes starting and ending white spaces from
string.
           
        }
    }
}