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Showing content from https://www.geeksforgeeks.org/c-sharp/c-sharp-check-if-arraylist-is-synchronized-thread-safe/ below:

C# | Check if ArrayList is Synchronized (thread safe)

Last Updated : 11 Jul, 2025

ArrayList.IsSynchronized Property

is used to get a value which indicate whether access to the

ArrayList

is synchronized (thread safe).

Syntax:

public virtual bool IsSynchronized { get; }

Return Value:

This property returns the

true

if access to the ArrayList is synchronized (thread safe) otherwise it returns

false

. The default is

false

. Below programs illustrate the use of above-discussed property:

Example 1: CSharp


 // C# code to check if ArrayList
// Is Synchronized or not
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an ArrayList
        ArrayList myList = new ArrayList();

        // Adding elements to ArrayList
        myList.Add("A");
        myList.Add("B");
        myList.Add("C");
        myList.Add("D");
        myList.Add("E");
        myList.Add("F");

        // Creates a synchronized
        // wrapper around the ArrayList
        ArrayList smyList = ArrayList.Synchronized(myList);

        // Displays the synchronization
        // status of both ArrayList
        Console.WriteLine("myList is {0}.", myList.IsSynchronized ?
                               "Synchronized" : "Not Synchronized");

        Console.WriteLine("smyList is {0}.", smyList.IsSynchronized ? 
                                "Synchronized" : "Not Synchronized");
    }
}

Output:

myList is Not Synchronized.
smyList is Synchronized.

Example 2: CSharp


 // C# code to check if ArrayList
// Is Synchronized or not
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an ArrayList
        ArrayList myList = new ArrayList();

        // Adding elements to ArrayList
        myList.Add(1);
        myList.Add(2);
        myList.Add(3);
        myList.Add(4);
        myList.Add(5);
        myList.Add(5);

        // the default is false for 
        // IsSynchronized property
        Console.WriteLine(myList.IsSynchronized);
    }
}

Note:

Retrieving the value of this property is an O(1) operation.
To guarantee the thread safety of the ArrayList, all operations must be done through the wrapper returned by the Synchronized method.
Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception.

Reference:

https://learn.microsoft.com/en-us/dotnet/api/system.collections.arraylist.issynchronized?view=netframework-4.7.2

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