Check if a Stack contains an element in C#

To check if a Stack has elements, use the C# Contains() method. Following is the code −

Example

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Stack<int> stack = new Stack<int>();
      stack.Push(100);
      stack.Push(150);
      stack.Push(175);
      stack.Push(200);
      stack.Push(225);
      stack.Push(250);
      stack.Push(300);
      stack.Push(400);
      stack.Push(450);
      stack.Push(500);
      Console.WriteLine("Elements in the Stack:");
      foreach(var val in stack){
         Console.WriteLine(val);
      }
      Console.WriteLine("Count of elements in the Stack = "+stack.Count);
      Console.WriteLine("Does Stack has the element 400?= "+stack.Contains(400));
   }
}

Output

This will produce the following output −

Elements in the Stack:
500
450
400
300
250
225
200
175
150
100
Count of elements in the Stack = 10 Does Stack has the element40400?= True

Example

Let us see another example −

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Stack<string> stack = new Stack<string>();
      stack.Push("Steve");
      stack.Push("Gary");
      stack.Push("Stephen");
      stack.Push("Nathan");
      stack.Push("Katie");
      stack.Push("Andy");
      stack.Push("David");
      stack.Push("Amy");
      Console.WriteLine("Elements in the Stack:");
      foreach(var val in stack){
         Console.WriteLine(val);
      }
      Console.WriteLine("Count of elements in the Stack = "+stack.Count);
      Console.WriteLine("Does Stack has the element 400?= "+stack.Contains("Michael"));
   }
}

Output

This will produce the following output −

Elements in the Stack:
Amy
David
Andy
Katie
Nathan
Stephen
Gary
Steve
Count of elements in the Stack = 8 Does Stack has the element 400?= False