C# | Check if two List objects are equal

Equals(Object) Method which is inherited from the Object class is used to check if a specified List<T> object is equal to another List<T> object or not.

Syntax:

public virtual bool Equals (object obj);

Here, obj is the object which is to be compared with the current object.

Return Value: This method return true if the specified object is equal to the current object otherwise it returns false.

Below programs illustrate the use of above-discussed method:

Example 1:

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// C# program to if a List object
// is equal to another List object
using System;
using System.Collections.Generic;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating an List<T> of Integers
        List<int> firstlist = new List<int>();
  
        // Adding elements to List
        firstlist.Add(17);
        firstlist.Add(19);
        firstlist.Add(21);
        firstlist.Add(9);
        firstlist.Add(75);
        firstlist.Add(19);
        firstlist.Add(73);
  
        // Checking whether firstlist is
        // equal to itself or not
        Console.WriteLine(firstlist.Equals(firstlist));
    }
}

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Output:

True

Example 2:

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// C# program to if a List object
// is equal to another List object
using System;
using System.Collections.Generic;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating a List of strings
        List<string> list1 = new List<string>();
  
        // Inserting elements in List
        list1.Add("DS");
        list1.Add("C++");
        list1.Add("Java");
        list1.Add("JavaScript");
  
        // Creating an List<T> of Integers
        List<int> list2 = new List<int>();
  
        // Adding elements to List
        list2.Add(78);
        list2.Add(44);
        list2.Add(27);
        list2.Add(98);
        list2.Add(74);
  
        // Checking whether list1 is
        // equal to list2 or not
        Console.WriteLine(list1.Equals(list2));
  
        // Creating a List of integers
        List<int> list3 = new List<int>();
  
        // Assigning list2 to list3
        list3 = list2;
  
        // Checking whether list3 is
        // equal to list2 or not
        Console.WriteLine(list3.Equals(list2));
    }
}

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Output:

False
True

Note: If the current instance is a reference type, the Equals(Object) method checks for reference equality.



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