Removing 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