C# - Stack.Contains() Method with Example

Learn, how to check element exist in stack or not in C#?
Submitted by IncludeHelp, on November 23, 2017 [Last updated : March 27, 2023]

C# Stack.Contains() Method

This is a method of 'Stack' class, its returns 'true' if stack contains given element else it returns 'false'.

Syntax

bool Contains(object item);

Parameter(s)

item : given item that is exist in stack or not.

Return Value

It does not return any value.

C# program to check given element exists in stack or not

using System;
using System.Collections;

namespace ConsoleApplication1 {
  class Program {
    static void Main() {
      Stack S = new Stack(5);

      S.Push(10);
      S.Push(20);
      S.Push(30);
      S.Push(40);

      if (S.Contains(30))
        Console.WriteLine("Item found in stack");
      else
        Console.WriteLine("Item did not find in stack");
    }
  }
}

Output

Item found in stack

Explanation

In this program, we are pushing 4 elements (10,20,30,40) in stack, and then we are checking item 30 is exist in stack or not using Contains method of Stack class?

Note: In above program, to use 'Stack' class, we need to include System.Collection namespace.

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