Mvc4 with entity framework soft delete and track creation , updation

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C#

MVC4

entity-framework

CREATE TABLE [dbo].[LoginLevel_TBL](
	[LoginLevel_ID] [int] IDENTITY(1,1) NOT NULL,
	[LoginLevel_Name] [varchar](500) NULL,
	[Create_Date] [datetime] NULL,
	[Update_Date] [datetime] NULL,
	[Delete_Date] [datetime] NULL,
	[Delete_Status] [bit] NULL,
	[Login_ID] [int] NULL,
 CONSTRAINT [PK_LoginLevel_TBL] PRIMARY KEY CLUSTERED 
(
	[LoginLevel_ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

This is my table where I create in sql server 2012 and connect with ado entity framework for c# application. For doing soft delete and track creation , updation I have tried a step create base entity and override dbcontext it work but when add a new table everything reset.

I face 2 issues when i am using the below code
It reset when i update entity frame work when i add a new table all the code i wrote is reset
Next one is when i update the created date also be modified,
when i delete by mofiy the below there is no possibilty the row is removed from DB

Please anyone help me i was stuck on this

What I have tried:

public class BaseEntity
  {
      public Nullable<System.DateTime> Create_Date { get; set; }
      public Nullable<System.DateTime> Update_Date { get; set; }
      public Nullable<System.DateTime> Delete_Date { get; set; }
      public Nullable<bool> Delete_Status { get; set; }
      public Nullable<int> Login_ID { get; set; }

  }

create above class and mofify the below file create by entity

 public class LoginLevel_TBL: BaseEntity
 public partial class SchoolDBEntities : DbContext
  public override int SaveChanges()
   {
       AddTimestamps();
       return base.SaveChanges();
   }
private void AddTimestamps()
   {
       var entities = ChangeTracker.Entries().Where(x => x.Entity is BaseEntity && (x.State == EntityState.Added || x.State == EntityState.Modified));

       var currentUsername = !string.IsNullOrEmpty(System.Web.HttpContext.Current?.User?.Identity?.Name)
           ? HttpContext.Current.User.Identity.Name
           : "Anonymous";

       foreach (var entity in entities)
       {
           if (entity.State == EntityState.Added)
           {
               ((BaseEntity)entity.Entity).DateCreated = DateTime.UtcNow;
               ((BaseEntity)entity.Entity).UserCreated = currentUsername;
           }

           ((BaseEntity)entity.Entity).DateModified = DateTime.UtcNow;
           ((BaseEntity)entity.Entity).UserModified = currentUsername;
       }
   }

I face 2 issues when i am using the below code
It reset when i update entity frame work when i add a new table all the code i wrote is reset
Next one is when i update the created date also be modified,
when i delete by mofiy the below there is no possibilty the row is removed from DB

Please anyone help me i was stuck on this