StringBuilder in C#.net

/*The String object is immutable. Every time you use one of the methods in the System.String class, you create a new string object in memory, which requires a new allocation of space for that new object. In situations where you need to perform repeated modifications to a string, the overhead associated with creating a new String object can be costly. The System.Text.StringBuilder class can be used when you want to modify a string without creating a new object. For example, using the StringBuilder class can boost performance when concatenating many strings together in a loop.*/
using System;
using System.Text;
namespace StringBuilderExample
{
class Program
{
static void Main(string[] args)
{
//Append
//The Append method can be used to add text or a string representation
//of an object to the end of a string represented by the current StringBuilder.
StringBuilder strBuilder = new StringBuilder("Hello World!");
strBuilder.Append(" Appended.");
Console.WriteLine(strBuilder);
//--------------------------------------------
//AppendFormat
//The AppendFormat method adds text to the end of the StringBuilder,but also implements the IFormattable interface and therefore accepts the standard format strings described in the formatting section.
//You can use this method to customize the format of variables and append those values to a StringBuilder.
int amount = 25;
StringBuilder strBuilder2 = new StringBuilder("Your total is ");
strBuilder2.AppendFormat("{0:C} ", amount);
Console.WriteLine(strBuilder2);
//-----------------------------------
//Insert
//The Insert method adds a string or object to a specified position in the current StringBuilder.
StringBuilder strBuilder3 = new StringBuilder("Hello World!");
strBuilder3.Insert(6, "Beautiful ");
Console.WriteLine(strBuilder3);
//---------------------------------------------------
//Remove
//You can use the Remove method to remove a specified number of characters from the current StringBuilder, beginning at a specified zero-based index.
StringBuilder strBuilder4 = new StringBuilder("Hello World!");
strBuilder4.Remove(5, 7);
Console.WriteLine(strBuilder4);
//----------------------------------------------------
//Replace
//The Replace method can be used to replace characters within the StringBuilder object with another specified character.
StringBuilder strBuilder5 = new StringBuilder("Hello World!");
strBuilder5.Replace('!', '?');
Console.WriteLine(strBuilder5);
Console.Read();
}
}
}