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How to use Tabs in ASP.NET CORE

I want to show Components in a tabs , so first of all create few components. In this project we have three components, First View Component  public class AllViewComponent : ViewComponent     {         private readonly UserManager<ApplicationUser> _userManager;         public AllViewComponent(UserManager<ApplicationUser> userManager)         {             _userManager = userManager;         }         public async Task<IViewComponentResult> InvokeAsync()         {             List<StudentViewModel> allUsers = new List<StudentViewModel>();             var items = await _userManager.Users.ToListAsync();             foreach (var item in items)             {                 allUsers.Add(new StudentViewModel {Id=item.Id, EnrollmentNo = item.EnrollmentNo, FatherName = item.FatherName, Name = item.Name, Age = item.Age, Birthdate = item.Birthdate, Address = item.Address, Gender = item.Gender, Email = item.Email });             }            

How to change Theme Dynamically using QueryString in ASP.NET

Introduction About Theme
Using theme you can change your page look or design.Themes define the style properties of a web page . Now, let's explore the elements of themes , such as skins, Cascading Style Sheets (CSS), and images. A skin is a file with the .skin extension that contains property settings for individual controls, such as Button, Textbox, or Label. You can either define skins for each control in different skin files or define skins for all the controls in a single file. The skin files with the .skin extension are created inside the subfolder of the App_Themes folder in the Solution Explorer window of a website.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="runtime.aspx.cs" Inherits="runtime" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server" Height="54px" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" Width="208px" AutoPostBack="True">
            <asp:ListItem>Select Theme</asp:ListItem>
            <asp:ListItem>Red</asp:ListItem>
            <asp:ListItem>Green</asp:ListItem>
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>

Codebehind



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class runtime : System.Web.UI.Page
{  
    protected void Page_PreInit(Object sender, EventArgs e)
    {
        if (Request.QueryString["Theme"] != null)
        {
            Page.Theme = Request.QueryString["Theme"].ToString();
        }
     
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        DropDownList1.AutoPostBack = true;

    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {      
            Response.Redirect("~/runtime.aspx?Theme=" + DropDownList1.SelectedValue);
     
        DropDownList1.AutoPostBack = false;
     

    }
}
Output
How to change theme using dropdownlist

How to change theme using dropdownlist

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