using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var test = new List<IntStringPair> 

        {

            new IntStringPair { id = 1, name = "Item 1" },

            new IntStringPair { id = 2, name = "Item 2" },

            new IntStringPair { id = 3, name = "Item 3" },

            new IntStringPair { id = 4, name = "Item 4" },

            new IntStringPair { id = 5, name = "Item 5" }

        };

        var foundItem = test.Select((item, index) => (item, index)).FirstOrDefault(x => x.item.id == 3);

        if (foundItem.item != null) 

        {

            test.RemoveAt(foundItem.index);

        }

        foreach (var item in test) 

        {

            Console.WriteLine(item.name);

        }

    }

}

​

public class IntStringPair 

{

    public int id { get; set; }

    public string name { get; set; }

}