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C# StringBuilder - GeeksforGeeks

Last Updated : 11 Jan, 2025

StringBuilder is a Dynamic Object. It doesn’t create a new object in the memory but dynamically expands the needed memory to accommodate the modified or new string.A String object is immutable, i.e. a String cannot be changed once created. To avoid string replacing, appending, removing or inserting new strings in the initial string C# introduce StringBuilder concept.

StringBuilder can be declared and initialized the same way as class,

StringBuilder s = new StringBuilder();
            
or
StringBuilder s = new StringBuilder("GeeksforGeeks");

“s” is the object of StringBuilder class. Also, we can pass a string value(here “GeeksforGeeks”) as an argument to the constructor of StringBuilder.

Although the StringBuilder is a dynamic object that allows you to expand the number of characters in the string that it encapsulates, you can specify a value for the maximum number of characters that it can hold. This value is called the capacity of the StringBuilder object.

StringBuilder s = new StringBuilder(20);
or
StringBuilder s = new StringBuilder("GeeksForGeeks", 20);

Here,

• In the 1st statement we pass an integer value as an argument to the constructor. This is the maximum capacity of character that can hold a string.
• In the 2nd statement we pass string value with an integer value (that is the maximum capacity of character a string can hold) as an argument to the constructor.

Method with Syntax

Description

The Append method can be used to add or append a string value of an object to the end of a string represented by the current StringBuilder object.

This method uses to format the input string into the specified format and then append it.

This method inserts the string at specified index in StringBuilder object.

This method removes the specified number of characters from the current StringBuilder object.

This method is used to replace characters within the StringBuilder object with another specified character.

Example 1: For appending string value in StringBuilder

// Adding element in StringBuilder Object
using System; 
using System.Text; 

class Geeks 
{ 
	// Main Method
	public static void Main() 
	{ 
		// "20" is capacity 
		StringBuilder s = new StringBuilder("HELLO ", 20); 
		
		s.Append("GFG"); 

		// after printing "GEEKS" 
		// a new line append 
		s.AppendLine("GEEKS"); 
		
		s.Append("GeeksForGeeks"); 
		Console.WriteLine(s); 
	} 
} 

HELLO GFGGEEKS
GeeksForGeeks

Example 2: Format the input string into the specified format and then append it.

// Adding the Formatted String in
// StringBuilder Object
using System; 
using System.Text; 

class Geeks 
{ 
	// Main Method 
	public static void Main() 
	{ 
		StringBuilder s = new StringBuilder("Your total amount is "); 

		// using the method 
		s.AppendFormat("{0:C} ", 50); 

		Console.WriteLine(s); 
	} 
} 

Your total amount is ?50.00 

Example 3: Insert string at specified value in StringBuilder object

// Inserting String at specified index
// position/index in StringBuilder 
using System; 
using System.Text; 

class Geeks 
{ 
	// Main Method 
	public static void Main() 
	{ 
		// "20" is capacity 
		StringBuilder s = new StringBuilder("HELLO ", 20); 
		
		// "GEEKS" insert after 6th index 
		s.Insert(6, "GEEKS"); 
		
		Console.WriteLine(s); 
	} 
} 

Example 4: Removes the specified number of characters from the StringBuilder Object

// Removing elements from particular
// indexes in StringBuilder Object
using System; 
using System.Text; 

class Geeks
{ 
	// Main Method 
	public static void Main() 
	{ 
		// "20" is capacity 
		StringBuilder s = new StringBuilder("GeeksForGeeks", 20); 

		// remove starts from index 5 
		// and remove happes 3 index 
		// after index 5 
		s.Remove(5, 3); 
		
		Console.WriteLine(s); 
	} 
} 

Example 5: Replace characters within the StringBuilder Object

// Replace Elements in StringBuilder Object
using System; 
using System.Text; 

class Geeks
{ 
	// Main Method 
	public static void Main() 
	{ 

		// "20" is capacity 
		StringBuilder s = new StringBuilder("GFG Geeks ", 20); 
		
		// Replace "GFG" with "Geeks For" 
		s.Replace("GFG", "Geeks For"); 

		Console.WriteLine(s); 
	} 
} 

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