String and StringBuilder :

String

A string is a sequential collection of Unicode characters that is used to represent text. A String Object is a sequential collection of system . Char object that represent a string. The Value of string object is the content of the sequential collection, and that value is immutable . The maximum size of a String Object in memory is 2GB,or about 1 billion characters.

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Properties:

There are two types of property in this

Length

Chars

Length:

In this we will specify the length of the character of given String .

Chars:

In this we will specify the position of the char.

Methods

Compare (String ,String ) :

In this methods compare String object and returns an integer value

Concat (String ,String) :

: In this we will Concatenates two specified instances of String.

Contains :

Return a value indicates whether the specified String object occurs within this String .

Copy :

Creates a new instance of String with the same value as a Specified String.

IndexOf(string)

Report the zero-based index of the first occurrence of the specified String in this instance .

LastindexOf(String)

Reports the zero based index position of the last occurrence of a specified String within this instance.

Remove (In32)

Returns a new string in which all the characters in the current instance ,begging at the specified position and continuing through the last position ,have been deleted.

ToLower () :

Returns a copy of this string converted to lowercase .

ToUpper() :

Returns a copy of this string converted to uppercase .

Trim () :

Remove all leading and trailing white -spaces characters from the current String object.

A simple Program using String Methods :

StrMethods.cs:
class StrMethods
{
 static void Main()
  {
	string[]  myStrings={"I" ,"am", "scanf", "hello"};
	string myStrings=String.Join(".",myString);
	string myString 10 =myString.Insert(6,"A");
	Console.WriteLine("myString.Insert(6,\"A,\")="+myString 10);
	string myString11=myString10.Remove(14,7);
	Console.WriteLine("myString10.Remove(14,7)=" +myString11)
	string myString12=myString11.Replace(',','?');
	Console.WriteLine("myString11. Replace(',','?')=" +myString12)
	string myString 13 =myString12. Replace ("I am scanf","hello");
	Console.WriteLine("myString11. Replace(\"I am scanf",\"hello")=" +myString13)
	Console.ReadLine();
  }
}