C# | Removing first occurrence of object from Collection<T>

Last Updated : 01 Feb, 2019

Collection<T>.Remove(T) is used to remove the first occurrence of a specific object from the Collection<T>.

Syntax:

public bool Remove (T item);

Here, item is the object to remove from the Collection<T>. The value can be null for reference types.

Return Value: True if item is successfully removed, otherwise, False. This method also returns False if item was not found in the original Collection<T>.

Below given are some examples to understand the implementation in a better way:

Example 1:

// C# code to remove the first 
// occurrence of a specific object 
// from the Collection 
using System; 
using System.Collections.Generic; 
using System.Collections.ObjectModel; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
        // Creating a collection of strings 
        Collection<string> myColl = new Collection<string>(); 
  
        // Adding elements in Collection myColl 
        myColl.Add("A"); 
        myColl.Add("B"); 
        myColl.Add("C"); 
        myColl.Add("D"); 
        myColl.Add("E"); 
  
        // Displaying the number of elements in myColl 
        Console.WriteLine("Count : " + myColl.Count); 
  
        // Displaying the elements in myColl 
        foreach(string str in myColl) 
        { 
            Console.WriteLine(str); 
        } 
  
        // Removing the first occurrence of 
        // a specific object from the Collection 
        myColl.Remove("C"); 
  
        // Displaying the number of elements in myColl 
        Console.WriteLine("Count : " + myColl.Count); 
  
        // Displaying the elements in myColl 
        foreach(string str in myColl) 
        { 
            Console.WriteLine(str); 
        } 
    } 
} 

Output:

Count : 5
A
B
C
D
E
Count : 4
A
B
D
E

Example 2:

// C# code to remove the first 
// occurrence of a specific object 
// from the Collection 
using System; 
using System.Collections.Generic; 
using System.Collections.ObjectModel; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
        // Creating a collection of ints 
        Collection<int> myColl = new Collection<int>(); 
  
        // Adding elements in Collection myColl 
        myColl.Add(2); 
        myColl.Add(3); 
        myColl.Add(4); 
        myColl.Add(4); 
        myColl.Add(5); 
  
        // Displaying the number of elements in myColl 
        Console.WriteLine("Count : " + myColl.Count); 
  
        // Displaying the elements in myColl 
        foreach(int i in myColl) 
        { 
            Console.WriteLine(i); 
        } 
  
        // Removing the first occurrence of 
        // a specific object from the Collection 
        myColl.Remove(4); 
  
        // Displaying the number of elements in myColl 
        Console.WriteLine("Count : " + myColl.Count); 
  
        // Displaying the elements in myColl 
        foreach(int i in myColl) 
        { 
            Console.WriteLine(i); 
        } 
    } 
} 