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C# String Class - GeeksforGeeks

Last Updated : 11 Jul, 2025

In C#, a string is a sequence of Unicode characters or an array of characters. The range of Unicode characters will be U+0000 to U+FFFF. The array of characters is also termed as the text. So the string is the representation of the text.

A string is represented by a class System.String. The String class is defined in the .NET base class library. In other words, a String object is a sequential collection of System.Char objects, which represent a string.

Characteristics of String Class:

• The System.String class is immutable, i.e., once created, its state cannot be altered.
• Provides the properties like length used to get a total number of characters present in the given string.
• String objects can include a null character, which counts as part of the string’s length.
• It provides the position of the characters in the given string called as indexes.
• It allows empty strings. Empty strings are valid instances of String objects that contain zero characters.
• It also supports searching strings, comparison of strings, testing of equality, modifying the string, normalization of string, copying of strings, etc.
• It also provides several ways to create strings like using a constructor, using concatenation, etc.

Example: Use of String class to print a message.

// C# Program to demonstrate the use of String class
using System;

class Geeks
{
    public static void Main()
    {  
		// Using String class
        String s = "Hello Geek";

		// Display the output
		System.Console.WriteLine(s);     
    }
}

Example: Creating a string using String class constructor String(Char*, Int32) and String([]).

// C# program to create 
// string using the constructor String(Char*, Int32), and String(Chars[]);
using System; 
class Geeks 
{ 

	public static void Main() 
	{ 
		char[] chars = { 'G', 'E', 'E', 'K', 'S' }; 

		// Create a string from a character array. 
		string s = new string(chars); 
		Console.WriteLine(s); 

		// Create a string that consists of 
		// a character repeated 5 times. 
		string s2 = new string('E', 5); 
		Console.WriteLine(s2); 
	} 
} 

In C# the String class has two properties.

• Chars[Int32]: Gets the Char object at a specified position in the current String object.
• Length: Gets the number of characters in the current String object.

Example: Using the Properties of string class.

// C# program to demonstrate the 
// String Class Properties 
using System; 

class Geeks 
{ 
	public static void Main() 
	{ 
		string str = "GeeksforGeeks"; 
		
		// using Chars[Int32] & Length property 
		
		for (int i = 0; i <= str.Length - 1; i++) 
			Console.Write("{0} ", str[i]); 
	} 
} 

G e e k s f o r G e e k s 

Example: Using Copy() and Compare() methods from the String class.

// C# program to illustrate
// String class methods
using System;

class Geeks
{
    static void copymethod()
    {
        string s = "GeeksforGeeks";
        string s2 = "geeks";
        Console.WriteLine("Original Strings: str1 = " + "'{0}' and str2 ='{1}'", s, s2);

        Console.WriteLine("");

        Console.WriteLine("After Copy method");
        Console.WriteLine("");

        // using the Copy method
        // to copy the value of str1
        // into str2
        s2 = String.Copy(s);

        Console.WriteLine("Strings are str1 = " + "'{0}' and str2='{1}'", s, s2);
    }

    // Main method
    static public void Main()
    {
        // variables
        string s1 = "geeksforgeeks";
        string s2 = "geeksforgeeks";

        bool result;

        // Compare(string, string) method return true
        // because the given strings are equal
        result = String.Compare(s1, s2) == 0;

        Console.WriteLine("Result of Compare Method: " + result);

        // calling method
        copymethod();
    }
}

Result of Compare Method: True
Original Strings: str1 = 'GeeksforGeeks' and str2 ='geeks'

After Copy method

Strings are str1 = 'GeeksforGeeks' and str2='GeeksforGeeks'

There are two operators string class

• Equality(String, String): Determines whether two specified strings have the same value.
• Inequality(String, String): Determines whether two specified strings have different values.

Example: Using Equality and Inequality operators of string class.

// Using the Operators of string class
using System;

class Geeks
{
	public static void Main()
	{
		string s1 = "WelcomeToGeeks";
		string s2 = "WelcomeToGeeks";
		bool res;

		// Equality operator return true
		// as both string are equal
		res = s1 == s2;
		Console.WriteLine($"The strings \"{s1}\" and \"{s2}\" equal: {res}");

		// Inequality operator return false
		// as both string are equal
		res = s1 != s2;
		Console.WriteLine($"The strings \"{s1}\" and \"{s2}\" not equal: {res}");
	}
}

The strings "WelcomeToGeeks" and "WelcomeToGeeks" equal: True
The strings "WelcomeToGeeks" and "WelcomeToGeeks" not equal: False

Important Points:

• The maximum size of the String object in memory can be 2GB or about 1 billion characters.
• A string that has been declared but has not been assigned a value is null. Attempting to call methods on that string throws a NullReferenceException.
• String Class can not be inherited because it is a sealed class.
• String Class present in the System namespace.

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