csharp exists in list

                
                        using System;
using System.Collections.Generic;
public class Program {

   public static void Main() {
      List < string > list1 = new List < string > () {
         "Lawrence",
         "Adams",
         "Pitt",
         "Tom"
      };

      Console.Write("List...\n");
      foreach(string list in list1) {
         Console.WriteLine(list);
      }

      Console.Write("Finding an item in the list...\n");
      if (list1.Contains("Adams") == true) {
         Console.WriteLine("Item exists!");
      } else {
         Console.WriteLine("Item does not exist!");
      }
   }
}
                    
                

csharp does value exist in list

                        
                                public int GetItemFromList() {
	List<Item> list = new List<Item>(
      new Item(1),
      new Item(2),
      new Item(3)
    );

	Item testItem = new Item(1);

	// Inside FindIndex() you can specify a lambda expression where you
	// query if an item exists like a boolean test.
	int index = list.FindIndex(item => testItem.Id == item.Id);

	// in this case out testItem.Id (1) is equal to an item in the list
	if (index > -1)
	{
		// We get here with the index 0!
      	return index;
	}
}

public class Item
{
	public int Id { get; set; }
	public Item() { }
	public Item(int id)
	{
		Id = id;
	}
}
                            
                        

check list exist in list csharp if matches any

                        
                                var items = (from x in parameters
                join y in myStrings on x.Source equals y
                select x)
            .ToList();
                            
                        

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