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C# StringCollection Class - GeeksforGeeks

C# StringCollection Class

Last Updated : 11 Jul, 2025

In C#, the StringCollection class is part of the System.Collections.Specialized namespace. It provides a collection of strings that allows us to store and manage a list of strings easily. This class is a type-safe collection that automatically resizes as needed.

StringCollection class accepts null as a valid value and allows duplicate elements.
String comparisons are case-sensitive.
Elements in this collection can be accessed using an integer index.
Indexes in this collection are zero-based.

Example: This example demonstrates how to add a string to a StringCollection and iterate over the collection to display its elements.


 // C# code to create a StringCollection 
using System; 
using System.Collections; 
using System.Collections.Specialized; 

class Geeks { 

	public static void Main() 
	{ 
		StringCollection s = new StringCollection(); 

		// Adding elements in StringCollection 
		s.Add("Geeks"); 
		s.Add("for"); 
		s.Add("Geeks"); 
	
		foreach(Object i in s) 
		{ 
			Console.WriteLine(i); 
		} 
	} 
}

Declaration of StringCollection

In C#, the declaration of StringCollection is as follow:

StringCollection collection = new StringCollection();

Constructor

StringCollection(): Initializes a new instance of the StringCollection class.

Example: This example demonstrates the working of StringCollection.


 // Example of StringCollection
using System; 
using System.Collections; 
using System.Collections.Specialized; 

class Geeks { 

	public static void Main() 
	{ 

		StringCollection s = new StringCollection(); 

		// Adding elements in StringCollection 
		s.Add("A"); 
		s.Add("B"); 
		s.Add("C");
	

		// Displaying objects 
		foreach(Object i in s) 
		{ 
			Console.WriteLine(i); 
		} 
	} 
}

Properties

The StringCollection class provides several properties to access its state.

Property Description Count Gets the number of strings contained in the StringCollection. IsReadOnly Gets a value indicating whether the StringCollection is read-only. IsSynchronized Gets a value indicating whether access to the StringCollection is synchronized (thread safe). Item[Int32] Gets or sets the element at the specified index. SyncRoot Gets an object that can be used to synchronize access to the StringCollection.

Example: This example demonstrates how to use StringColelction class, including the AddRange method to add multiple elements, the IsReadOnly property to check if the collection is ready to read-only and the count property to get the number of elements in the collection.


 // C# code to demonstrates the StringCollection 
// Class Properties 
using System; 
using System.Collections; 
using System.Collections.Specialized; 

class Geeks { 

	public static void Main() 
	{ 

		// creating a StringCollection 
		StringCollection s = new StringCollection(); 

		// creating a string array 
		String[] arr = new String[] { "A", "B", "C", "D", "E" }; 

		// Copying the elements of a string 
		// array to the end of the StringCollection
		s.AddRange(arr); 

		// IsReadOnly Property
		
		// checking if StringCollection is 
		// read-only 
		Console.WriteLine(s.IsReadOnly); 
		
		// Using Count Property
		
		// To get number of Strings contained 
		// in the StringCollection 
		Console.WriteLine("Number of strings are: "
											+ s.Count); 
	} 
}

Output

False
Number of strings are: 5

Methods Method Description Add(String) Adds a string to the end of the StringCollection. AddRange(String[]) Copies the elements of a string array to the end of the StringCollection. Clear() Removes all the strings from the StringCollection. Contains(String) Determines whether the specified string is in the StringCollection. CopyTo(String[], Int32) Copies the entire StringCollection values to a one-dimensional array of strings, starting at the specified index of the target array. Equals(Object) Determines whether the specified object is equal to the current object. GetEnumerator() Returns a StringEnumerator that iterates through the StringCollection. GetHashCode() Serves as the default hash function. GetType() Gets the Type of the current instance. IndexOf(String) Searches for the specified string and returns the zero-based index of the first occurrence within the StringCollection. Insert(Int32, String) Inserts a string into the StringCollection at the specified index. MemberwiseClone() Creates a shallow copy of the current Object. Remove(String) Removes the first occurrence of a specific string from the StringCollection. RemoveAt(Int32) Removes the string at the specified index of the StringCollection. ToString() Returns a string that represents the current object.

Example 1: This example demonstrates how to use AddRange and CopyTo method of the StringCollection class to copy elements from a collection to a string array.


 // C# code to copy StringCollection to array, 
// starting at the specified index of 
// the target array 
using System;
using System.Collections;
using System.Collections.Specialized;

class Geeks {

    public static void Main()
    {
        // creating a StringCollection named s 
        StringCollection s = new StringCollection();

        // creating a string array named arr
        String[] arr = new String[] { "A", "B", "C", "D", "E" };

        // Copying the elements of a string 
        // array to the end of the StringCollection 
        s.AddRange(arr);

        // creating a String array named arr2 
        String[] arr2 = new String[s.Count];

        // Copying StringCollection to array arr2 
        // starting from index 0 
        s.CopyTo(arr2, 0);

        // Displaying elements in array arr2 
        for (int i = 0; i < arr2.Length; i++) {
            Console.WriteLine(arr2[i]);
        }
    }
}

Example 2: This example demonstrates how to add elements to a StringCollection using AddRange, display its elements and then remove all elements using the clear() method.


 // C# code to insert a string into 
// the StringCollection at the 
// specified index 
using System;
using System.Collections;
using System.Collections.Specialized;

class Geeks {
 
    public static void Main()
    {
        // creating a StringCollection named s 
        StringCollection s = new StringCollection();

        // creating a string array named arr
        String[] arr = new String[] { "A", "B",
                "C", "D" };

        // Copying the elements of a string 
        // array to the end of the StringCollection
        s.AddRange(arr);

        Console.WriteLine("Initially elements in StringCollection are: ");

        // Displaying elements in StringCollection  
        foreach(Object i in s)
        Console.WriteLine(i);

        // Removing all the elements from StringCollection 
        s.Clear();

        Console.WriteLine("After Removing: ");

        // Displaying elements in StringCollection 
        foreach(Object i in s)
        Console.WriteLine(i);
    }
}

Output

Initially elements in StringCollection are: 
A
B
C
D
After Removing:

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