c# - How to insert an object at the top of the Stack

Insert an object at the top of the Stack
The Stack class represents a simple last-in-first-out non-generic collection of objects. The Stack capacity is the number of elements it can hold. When elements are added to a Stack, its capacity is automatically increased as required through reallocation. The Stack accepts null as a valid value and allows duplicate elements.

The following .net c# tutorial code demonstrates how we insert an object at the top of the Stack. In this .net c# tutorial code, we used the Stack class Push() method to insert an object at the top of a Stack.

The Stack class Push(Object) method inserts an object at the top of the Stack. The Stack class Push(object? obj) method has a parameter named obj. The obj parameter is the Object to push onto the Stack. The value can be null.
StackPushMethod.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<!DOCTYPE html>
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Stack colors = new Stack();

        colors.Push("Blue");
        colors.Push("DodgerBlue");
        colors.Push("SkyBlue");
        colors.Push("LightBlue");
        colors.Push("DeepSkyBlue");

        Label1.Text = "Stack Elements... ";
        Label1.Text += "<font color=DarkOrchid>";
        foreach (string color in colors)
        {
            Label1.Text += "<br />" + color;
        }
        Label1.Text += "</font>";

        colors.Push("MidnightBlue");

        Label1.Text += "<br /><br />After inserting an object at the top of the Stack";
        Label1.Text += "<br />using Push(object) method. Now Stack Elements...<br />";
        Label1.Text += "<font color=DarkOrchid>";
        foreach (string color in colors)
        {
            Label1.Text += "<br />" + color;
        }
        Label1.Text += "</font>";

    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Stack Push() Method - How to insert an object at the top of the Stack</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:MidnightBlue; font-style:italic;">
            System.Collections.Stack Push() Method
            <br /> How to insert an object at the top of the Stack
        </h2>
        <hr width="475" align="left" color="Navy" />
        <br />
        <asp:Label
             ID="Label1"
             runat="server"
             ForeColor="DarkOliveGreen"
             Font-Size="Large"
             Font-Names="Courier New"
             Font-Italic="true"
             Font-Bold="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Button 
            ID="Button1"
            runat="server"
            OnClick="Button1_Click"
            Text="Test Stack Push() Method"
            Height="45"
            Font-Bold="true"
            ForeColor="DodgerBlue"
            />
    </div>
    </form>
</body>
</html>
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