How to Create a stack from a collection in C#

Stack myStack = new Stack();
myStack.Push(100);
myStack.Push(200);
myStack.Push(300);
myStack.Push(400);

foreach (var item in myStack)
     Console.Write(item + ","); //Output are- 400,300,200,100 

https://www.tutorialsteacher.com/csharp/csharp-stack

Stack represents a last-in, first out collection of object. It is used when you need a last-in, first-out access to items. When you add an item in the list, it is called pushing the item and when you remove it, it is called popping the item. This class comes under System.Collections namespace.

// C# code to create a Stack
using System;
using System.Collections;
class GFG {
    // Driver code
    public static void Main()
    {
	// Creating a Stack
	Stack myStack = new Stack();

	// Inserting the elements into the Stack
	myStack.Push("1st Element");
	myStack.Push("2nd Element");
	myStack.Push("3rd Element");
	myStack.Push("4th Element");
	myStack.Push("5th Element");
	myStack.Push("6th Element");

	// Displaying the count of elements
	// contained in the Stack
	Console.Write("Total number of elements in the Stack are : ");

	 Console.WriteLine(myStack.Count);

	// Displaying the top element of Stack
	// without removing it from the Stack
	Console.WriteLine("Element at the top is : " + myStack.Peek());

	// Displaying the top element of Stack
	// without removing it from the Stack
	Console.WriteLine("Element at the top is : " + myStack.Peek());

	// Displaying the count of elements
	// contained in the Stack
	Console.Write("Total number of elements in the Stack are : ");

	Console.WriteLine(myStack.Count);
    }
}

https://www.geeksforgeeks.org/c-sharp-stack-class/

Hi,

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

Example:

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

   public static void Main()  {

      // Creates and initializes a new Stack.
      Stack sampleStack = new Stack();
      sampleStack.Push("Hi");
      sampleStack.Push("rijsat.com");
      sampleStack.Push("!");

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

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


/*
This code produces the following output.

sampleStack
    Count:    3
    Values:    !    rijsat.com    Hi
*/

https://learn.microsoft.com/en-us/dotnet/api/system.collections.stack?view=net-6.0

https://www.c-sharpcorner.com/UploadFile/c25b6d/working-on-stack-using-C-Sharp/