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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.collections.stack below:

Stack Class (System.Collections) | Microsoft Learn

Stack Class Definition

Represents a simple last-in-first-out (LIFO) non-generic collection of objects.

public ref class Stack : System::Collections::ICollection

public ref class Stack : ICloneable, System::Collections::ICollection

public class Stack : System.Collections.ICollection

public class Stack : ICloneable, System.Collections.ICollection

[System.Serializable]
public class Stack : ICloneable, System.Collections.ICollection

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class Stack : ICloneable, System.Collections.ICollection

type Stack = class
    interface ICollection
    interface IEnumerable

type Stack = class
    interface ICollection
    interface IEnumerable
    interface ICloneable

[<System.Serializable>]
type Stack = class
    interface ICollection
    interface IEnumerable
    interface ICloneable

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type Stack = class
    interface ICollection
    interface IEnumerable
    interface ICloneable

Public Class Stack
Implements ICollection

Public Class Stack
Implements ICloneable, ICollection

Inheritance

Attributes

Implements

Examples

The following example shows how to create and add values to a Stack and how to display its values.

using System;
using System.Collections;
public class SamplesStack  {

   public static void Main()  {

      // Creates and initializes a new Stack.
      Stack myStack = new Stack();
      myStack.Push("Hello");
      myStack.Push("World");
      myStack.Push("!");

      // Displays the properties and values of the Stack.
      Console.WriteLine( "myStack" );
      Console.WriteLine( "\tCount:    {0}", myStack.Count );
      Console.Write( "\tValues:" );
      PrintValues( myStack );
   }

   public static void PrintValues( IEnumerable myCollection )  {
      foreach ( Object obj in myCollection )
         Console.Write( "    {0}", obj );
      Console.WriteLine();
   }
}


/*
This code produces the following output.

myStack
    Count:    3
    Values:    !    World    Hello
*/

Imports System.Collections

Public Class SamplesStack    
    
    Public Shared Sub Main()
    
        ' Creates and initializes a new Stack.
        Dim myStack As New Stack()
        myStack.Push("Hello")
        myStack.Push("World")
        myStack.Push("!")
        
        ' Displays the properties and values of the Stack.
        Console.WriteLine("myStack")
        Console.WriteLine(ControlChars.Tab & "Count:    {0}", myStack.Count)
        Console.Write(ControlChars.Tab & "Values:")
        PrintValues(myStack)
    End Sub
    
    Public Shared Sub PrintValues(myCollection As IEnumerable)
        Dim obj As [Object]
        For Each obj In  myCollection
            Console.Write("    {0}", obj)
        Next obj
        Console.WriteLine()
    End Sub

End Class

' This code produces the following output.
'
' myStack
'     Count:     3
'     Values:    !    World    Hello

The capacity of a Stack is the number of elements the Stack can hold. As elements are added to a Stack, the capacity is automatically increased as required through reallocation.

If Count is less than the capacity of the stack, Push is an O(1) operation. If the capacity needs to be increased to accommodate the new element, Push becomes an O(n) operation, where n is Count. Pop is an O(1) operation.

Stack accepts null as a valid value and allows duplicate elements.

Constructors Stack()

Initializes a new instance of the Stack class that is empty and has the default initial capacity.

Stack(ICollection)

Initializes a new instance of the Stack class that contains elements copied from the specified collection and has the same initial capacity as the number of elements copied.

Stack(Int32)

Initializes a new instance of the Stack class that is empty and has the specified initial capacity or the default initial capacity, whichever is greater.

Properties Count

Gets the number of elements contained in the Stack.

IsSynchronized

Gets a value indicating whether access to the Stack is synchronized (thread safe).

SyncRoot

Gets an object that can be used to synchronize access to the Stack.

Methods Extension Methods Thread Safety

Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

To guarantee the thread safety of the Stack, all operations must be done through the wrapper returned by the Synchronized(Stack) method.

Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.