Removing the object from the top of the Stack in C#

Stack<T>.Pop Method is used to remove and returns the object at the top of the Stack<T>. This method comes under the System.Collections.Generic namespace.

Syntax:

public T Pop ();

Return Value: It returns the Object which is to be removed from the top of the Stack.

Exception : This method will give InvalidOperationException if the Stack<T> is empty.

Below programs illustrate the use of the above-discussed method:

Example 1:

// C# Program to illustrate the
// use of Stack<T>.Pop() Method
using System;
using System.Collections.Generic;

class GFG {

    // Main Method
    public static void Main()
    {

        // Creating a Stack of Strings
        Stack<string> myStack = new Stack<string>();

        // Inserting the elements into the Stack
        myStack.Push("Geeks");
        myStack.Push("Geeks Classes");
        myStack.Push("Noida");
        myStack.Push("Data Structures");
        myStack.Push("GeeksforGeeks");

        Console.WriteLine("Number of elements in the Stack: {0}",
                                                 myStack.Count);

        // Retrieveing top element of Stack
        Console.Write("Top element of Stack is: ");
        Console.Write(myStack.Pop());

        // printing the no of Stack element
        // after Pop operation
        Console.WriteLine("\nNumber of elements in the Stack: {0}",
                                                    myStack.Count);
    }
}

Output:

Number of elements in the Stack: 5
Top element of Stack is: GeeksforGeeks
Number of elements in the Stack: 4

Example 2:

// C# Program to illustrate the
// use of Stack<T>.Pop() Method
using System;
using System.Collections.Generic;

class GFG {

    // Main Method
    public static void Main()
    {

        // Creating a Stack of integers
        Stack<int> myStack = new Stack<int>();

        // Inserting the elements into the Stack
        myStack.Push(7);
        myStack.Push(9);

        Console.WriteLine("Number of elements in the Stack: {0}",
                                                  myStack.Count);

        // Retrieveing top element of Stack
        Console.Write("Top element of Stack is: ");
        Console.Write(myStack.Pop());

        // printing the no of Stack element
        // after Pop operation
        Console.WriteLine("\nNumber of elements in the Stack: {0}",
                                                    myStack.Count);
    }
}

Output:

Number of elements in the Stack: 2
Top element of Stack is: 9
Number of elements in the Stack: 1

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.stack-1.pop?view=netframework-4.7.2