Remove First Occurrence of Object from Collection in C#

To remove the first occurrence of the object from Collection, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.ObjectModel;
public class Demo {
   public static void Main(){
      Collection<string> col = new Collection<string>();
      col.Add("Andy");
      col.Add("Kevin");
      col.Add("John");
      col.Add("Nathan");
      col.Add("Nathan");
      col.Add("Katie");
      col.Add("Barry");
      col.Add("Nathan");
      col.Add("Mark");
      Console.WriteLine("Count of elements = "+ col.Count);
      Console.WriteLine("Iterating through the collection...");
      var enumerator = col.GetEnumerator();
      while (enumerator.MoveNext()) {
         Console.WriteLine(enumerator.Current);
      }
      col.Remove("Nathan");
      Console.WriteLine("Count of elements (updated) = "+ col.Count);
      Console.WriteLine("Iterating through the collection... (updated)");
      enumerator = col.GetEnumerator();
      while (enumerator.MoveNext()) {
         Console.WriteLine(enumerator.Current);
      }
   }
}

Output

This will produce the following output −

Count of elements = 9
Iterating through the collection... Andy
Kevin
John
Nathan
Nathan
Katie
Barry
Nathan
Mark
Count of elements (updated) = 8 
Iterating through the collection... (updated)
Andy
Kevin
John
Nathan
Katie
Barry
Nathan
Mark

Example

Let us see another example −

 Live Demo

using System;
using System.Collections.ObjectModel;
public class Demo {
   public static void Main(){
      Collection<string> col = new Collection<string>();
      col.Add("One");
      col.Add("Two");
      col.Add("Two");
      col.Add("Four");
      col.Add("Five");
      col.Add("Two");
      col.Add("Six");
      col.Add("Seven");
      Console.WriteLine("Count of elements = "+ col.Count);
      Console.WriteLine("Iterating through the collection...");
      var enumerator = col.GetEnumerator();
      while (enumerator.MoveNext()) {
         Console.WriteLine(enumerator.Current);
      }
      col.Remove("Two");
      Console.WriteLine("Count of elements = "+ col.Count);
      Console.WriteLine("Iterating through the collection... (updated)");
      enumerator = col.GetEnumerator();
      while (enumerator.MoveNext()) {
         Console.WriteLine(enumerator.Current);
      }
   }
}

Output

This will produce the following output −

Count of elements = 8
Iterating through the collection...
One
Two
Two
Four
Five
Two
Six
Seven
Count of elements = 7
Iterating through the collection... (updated)
One
Two
Four
Five
Two
Six
Seven