Package: Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation
Program.cs page add
// this will provide ablity to referesh pages at runtime
builder.Services.AddControllersWithViews().AddRazorRuntimeCompilation();

Package:

Microsoft.EntityFrameworkCore.SqlServer
Microsoft.EntityFrameworkCore.Tools
Microsoft.EntityFrameworkCore.Design

Scaffold-DbContext "Data Source=Server_Name; Initial Catalog=DataBase_Name; User ID=sa; Password=123456" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -f

Package: Microsoft.AspNetCore.Session
In program.cs file

builder.Services.AddControllersWithViews().AddRazorRuntimeCompilation();
builder.Services.AddDistributedMemoryCache(); // for session
builder.Services.AddSession(options => {
  options.IdleTimeout = TimeSpan.FromMinutes(20);//You can set Time
  }); // for session
builder.Services.AddHttpContextAccessor();
builder.Services.AddSingleton();
app.UseSession(); // for session
// before below code
app.MapControllerRoute(
   name: "default",
   pattern: "{controller=Home}/{action=Index}/{id?}");

Get Session in View

Add Below in Top
  @using Microsoft.AspNetCore.Http
  @inject IHttpContextAccessor HttpContextAccessor

For Accessing Session
  @HttpContextAccessor.HttpContext.Session.GetString("SessionName")

Get Session in Controller

For Accessing Session
  HttpContext.Session.GetInt32("SessionName");

Get and Set a Class in Session
Create a SessionHelper.cs file with below code

using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
public static class SessionHelper
 {
  public static void SetObjectInSession(this ISession session, string key, object value)
  {
     string str = JsonConvert.SerializeObject(value);
     session.SetString(key, JsonConvert.SerializeObject(value));
  }
  public static T GetCustomObjectFromSession(this ISession session, string key)
  {
    var value = session.GetString(key);
    return value == null ? default(T) : JsonConvert.DeserializeObject(value);
  }
 }

Set Object
HttpContext.Session.SetObjectInSession("SessionName", ClassObject);

Get Object
HttpContext.Session.GetCustomObjectFromSession("SessionName");

Data Annotations are used for Validating User Input.
Namespace : System.ComponentModel.DataAnnotations

• Required For Mandatory fields
  [Required(ErrorMessage = "ID is Required")]
  public string ID { get; set; }
• DisplayName For Fields Name
  [DisplayName("Enter Your Name: ")]
  public string Name { get; set; }
• StringLength for specifying Minimum and Maximum length of string
  [StringLength(50, MinimumLength = 5)]
  public string fullName { get; set; }
• Range For specifying Range in a numeric value
  [Range(18,60, ErrorMessage ="Age must be between 18-60 in years.")]
  public int Age { get; set; }
• Bind For Binding to Model Property(Include/Exclude)
  [Bind(Exclude = "Id")]
  
• ScaffoldColumn For hiding from editor forms
  [ScaffoldColumn(false)]
  public int Id { get; set; }
• DisplayFormat To specifies a display format for a field like Date , Currency etc
  [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy hh:mm:ss tt}")]
  public System.DateTime? HireDate { get; set; }
• ReadOnly To set a field to read-only.
  [ReadOnly(true)]
  public string Name { get; private set; }
• MaxLength To Specify maximum length of a string
  [MaxLength(50)]
  public string Name { get; set; }
• Compare To compare with other fields
  [Compare("Password", ErrorMessage = "Password doesn't Match")]
  public string ConfirmPassword {get; set;}
• RegularExpression To specifies that input field is matched with desired Regular Expression.
  [RegularExpression(@"[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}", ErrorMessage = "Incorrect Email ID")]
  public string EmailID { get; set; }
• HiddenInput To specifies a hidden input field.
  [System.Web.Mvc.HiddenInput(DisplayValue = false)]
  public string Name { get; set; }
• DataType
  To provides a list of data type that is associated with input field and parameter. [DataType(DataType.EmailAddress)]
  public string Email { get; set; }
• Timestamp
  
  
• ConcurrencyCheck
  
  

Namespace : System.ComponentModel.DataAnnotations.Schema

• Table
  
  
• Column
  
  
• Index
  
  
• ForeignKey
  
  
• NotMapped
  
  
• InverseProperty