Finding multiple items in C# Generic List

Introduction

Let us say we have a list of integer and we want to find all the number greater than 100.
If list is as follow

List<int> lst = new List<int>();
            lst.Add(20);
            lst.Add(300);
            lst.Add(400);
            lst.Add(9);
            lst.Add(19);
            lst.Add(789);
            lst.Add(45); 

 Now if we print this list

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication24
{class Program
    {static void Main(string[] args)
        {

            List<int> lst = new List<int>();
            lst.Add(20);
            lst.Add(300);
            lst.Add(400);
            lst.Add(9);
            lst.Add(19);
            lst.Add(789);
            lst.Add(45);foreach(var r in lst)
            {
                Console.WriteLine(r);
            }
            Console.ReadKey(true);

        }
    }
}

Output 

Now we need to find the entire element in the list greater than 100. So for this purpose we will use FindAll()

We can see that FindAll() takes a predicate.  So we need to create a predicate and that takes an integer as input parameter.

public static bool GreaterThanHun(int value)
        {if (value > 100)return true;elsereturn false; 
        }

 So when we now call this predicate as input parameter of FindAll() we will get the desired result of list numbers greater than 100. 

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication24
{class Program
    {static void Main(string[] args)
        {

            List<int> lst = new List<int>();
            lst.Add(20);
            lst.Add(300);
            lst.Add(400);
            lst.Add(9);
            lst.Add(19);
            lst.Add(789);
            lst.Add(45);foreach(var r in lst)
            {
                Console.WriteLine(r);
            }
            Console.ReadKey(true);

            List<int> lstgrthund = lst.FindAll(GreaterThanHun);foreach (var r in lstgrthund)
            {
                Console.WriteLine(r);

            }
            Console.ReadKey(true);
            

        }public static bool GreaterThanHun(int value)
        {if (value > 100)return true;elsereturn false; 
        }
    
    }
}

 Output 

that's all. hope help to all.thank you for reading.